diff --git a/app/javascript/mastodon/components/form_fields/combobox.module.scss b/app/javascript/mastodon/components/form_fields/combobox.module.scss
index ca7bc2020b..ef230a77b8 100644
--- a/app/javascript/mastodon/components/form_fields/combobox.module.scss
+++ b/app/javascript/mastodon/components/form_fields/combobox.module.scss
@@ -25,7 +25,7 @@
 .popover {
   z-index: 9999;
   box-sizing: border-box;
-  max-height: max(200px, 30dvh);
+  max-height: min(320px, 50dvh);
   padding: 4px;
   border-radius: 4px;
   color: var(--color-text-primary);
@@ -63,13 +63,7 @@
   user-select: none;
 
   &[data-highlighted='true'] {
-    color: var(--color-text-on-brand-base);
-    background: var(--color-bg-brand-base);
-
-    &[aria-disabled='true'] {
-      color: var(--color-text-on-disabled);
-      background: var(--color-bg-disabled);
-    }
+    background: var(--color-bg-overlay-highlight);
   }
 
   &[aria-disabled='true'] {
diff --git a/app/javascript/mastodon/components/form_fields/combobox_field.tsx b/app/javascript/mastodon/components/form_fields/combobox_field.tsx
index 6cc68b90bf..64cbb3ce8a 100644
--- a/app/javascript/mastodon/components/form_fields/combobox_field.tsx
+++ b/app/javascript/mastodon/components/form_fields/combobox_field.tsx
@@ -82,11 +82,12 @@ interface ComboboxProps<
    * Customise the rendering of group titles.
    * The `titleId` must be attached to the element that provides the
    * accessible name for the group.
+   * Return `null` to omit rendering the group title.
    */
   renderGroupTitle?: (
     groupKey: GroupKey,
     titleId: string,
-  ) => React.ReactElement | string;
+  ) => React.ReactElement | null;
   /**
    * The main selection handler, called when an option is selected or deselected.
    */
@@ -182,7 +183,12 @@ const ComboboxWithRef = <Item extends ComboboxItem, GroupKey extends string>(
 
   const hasGroups = !Array.isArray(items);
   const flatItems = useMemo(
-    () => (hasGroups ? (Object.values(items).flat() as Item[]) : items),
+    () =>
+      hasGroups
+        ? (Object.values(items)
+            .flat()
+            .filter((i) => !!i) as Item[])
+        : items,
     [hasGroups, items],
   );
 
@@ -478,10 +484,11 @@ const ComboboxWithRef = <Item extends ComboboxItem, GroupKey extends string>(
                   {(Object.keys(items) as GroupKey[]).map((groupKey) => {
                     const groupItems = items[groupKey];
                     const groupTitleId = `${listId}-group-${groupKey}`;
-                    const groupTitle = renderGroupTitle?.(
+                    const customGroupTitle = renderGroupTitle?.(
                       groupKey,
                       groupTitleId,
-                    ) ?? <span id={groupTitleId}>{groupKey}</span>;
+                    );
+                    const hasTitle = customGroupTitle !== null;
 
                     if (!groupItems?.length) return null;
 
@@ -489,11 +496,18 @@ const ComboboxWithRef = <Item extends ComboboxItem, GroupKey extends string>(
                       <ul
                         key={groupKey}
                         role='group'
-                        aria-labelledby={groupTitleId}
+                        aria-labelledby={hasTitle ? groupTitleId : undefined}
                       >
-                        <li role='presentation' className={classes.groupLabel}>
-                          {groupTitle}
-                        </li>
+                        {hasTitle && (
+                          <li
+                            role='presentation'
+                            className={classes.groupLabel}
+                          >
+                            {customGroupTitle ?? (
+                              <span id={groupTitleId}>{groupKey}</span>
+                            )}
+                          </li>
+                        )}
                         {renderItems(groupItems)}
                       </ul>
                     );
diff --git a/app/javascript/mastodon/components/list_item/index.tsx b/app/javascript/mastodon/components/list_item/index.tsx
index 66758bd4de..263e206fb9 100644
--- a/app/javascript/mastodon/components/list_item/index.tsx
+++ b/app/javascript/mastodon/components/list_item/index.tsx
@@ -14,8 +14,9 @@ interface WrapperProps extends Omit<
 /**
  * A basic list item component that can be used as a base for more bespoke list items.
  *
- * Depending on functionality, use `ListItemButton` or `ListItemLink` as a child of the
- * wrapper component.
+ * Choose the child of the wrapper component based on needed interactivity:
+ * `ListItemContent` for a non-interactive item, `ListItemButton` or `ListItemLink`
+ * for interactive items.
  */
 export const ListItemWrapper: React.FC<WrapperProps> = ({
   icon,
@@ -33,10 +34,31 @@ export const ListItemWrapper: React.FC<WrapperProps> = ({
   );
 };
 
-interface LinkProps extends React.ComponentPropsWithoutRef<typeof Link> {
+interface WithSubtitle {
   subtitle?: React.ReactNode;
 }
 
+interface ContentProps
+  extends React.ComponentPropsWithoutRef<'h3'>, WithSubtitle {}
+
+export const ListItemContent: React.FC<ContentProps> = ({
+  subtitle,
+  children,
+  ...otherProps
+}) => {
+  return (
+    <>
+      <h3 className={classes.title} {...otherProps}>
+        {children}
+      </h3>
+      {subtitle && <div className={classes.subtitle}>{subtitle}</div>}
+    </>
+  );
+};
+
+interface LinkProps
+  extends React.ComponentPropsWithoutRef<typeof Link>, WithSubtitle {}
+
 export const ListItemLink: React.FC<LinkProps> = ({
   subtitle,
   children,
@@ -44,20 +66,16 @@ export const ListItemLink: React.FC<LinkProps> = ({
   ...otherProps
 }) => {
   return (
-    <>
-      <h3 className={classes.title}>
-        <Link className={classNames(className, 'focusable')} {...otherProps}>
-          {children}
-        </Link>
-      </h3>
-      {subtitle && <div className={classes.subtitle}>{subtitle}</div>}
-    </>
+    <ListItemContent subtitle={subtitle}>
+      <Link className={classNames(className, 'focusable')} {...otherProps}>
+        {children}
+      </Link>
+    </ListItemContent>
   );
 };
 
-interface ButtonProps extends React.ComponentPropsWithoutRef<'button'> {
-  subtitle?: React.ReactNode;
-}
+interface ButtonProps
+  extends React.ComponentPropsWithoutRef<'button'>, WithSubtitle {}
 
 export const ListItemButton: React.FC<ButtonProps> = ({
   subtitle,
@@ -66,17 +84,14 @@ export const ListItemButton: React.FC<ButtonProps> = ({
   ...otherProps
 }) => {
   return (
-    <>
-      <h3 className={classes.title}>
-        <button
-          type='button'
-          className={classNames(className, 'focusable')}
-          {...otherProps}
-        >
-          {children}
-        </button>
-      </h3>
-      {subtitle && <div className={classes.subtitle}>{subtitle}</div>}
-    </>
+    <ListItemContent subtitle={subtitle}>
+      <button
+        type='button'
+        className={classNames(className, 'focusable')}
+        {...otherProps}
+      >
+        {children}
+      </button>
+    </ListItemContent>
   );
 };
diff --git a/app/javascript/mastodon/components/list_item/list_item.stories.tsx b/app/javascript/mastodon/components/list_item/list_item.stories.tsx
index d46102c1c3..dd066683c9 100644
--- a/app/javascript/mastodon/components/list_item/list_item.stories.tsx
+++ b/app/javascript/mastodon/components/list_item/list_item.stories.tsx
@@ -7,18 +7,31 @@ import VisibilityOffIcon from '@/material-icons/400-24px/visibility_off.svg?reac
 
 import { Icon } from '../icon';
 
-import { ListItemWrapper, ListItemButton, ListItemLink } from './index';
+import {
+  ListItemWrapper,
+  ListItemContent,
+  ListItemButton,
+  ListItemLink,
+} from './index';
 
 const meta = {
   title: 'Components/ListItem',
   component: ListItemWrapper,
-  subcomponents: { ListItemButton, ListItemLink },
+  subcomponents: { ListItemContent, ListItemButton, ListItemLink },
 } satisfies Meta<typeof ListItemWrapper>;
 
 export default meta;
 
 type Story = StoryObj<typeof meta>;
 
+export const NonInteractive: Story = {
+  render: () => (
+    <ListItemWrapper icon={<Icon icon={VisibilityIcon} id='visibility' />}>
+      <ListItemContent>View more</ListItemContent>
+    </ListItemWrapper>
+  ),
+};
+
 export const WithButton: Story = {
   render: () => (
     <ListItemWrapper
diff --git a/app/javascript/mastodon/features/collections/editor/accounts.tsx b/app/javascript/mastodon/features/collections/editor/accounts.tsx
index da99bdbae3..ec6dbdac27 100644
--- a/app/javascript/mastodon/features/collections/editor/accounts.tsx
+++ b/app/javascript/mastodon/features/collections/editor/accounts.tsx
@@ -10,8 +10,13 @@ import { AccountListItem } from 'mastodon/components/account_list_item';
 import { Avatar } from 'mastodon/components/avatar';
 import { Button } from 'mastodon/components/button';
 import { DisplayName } from 'mastodon/components/display_name';
+import { useAccountHandle } from 'mastodon/components/display_name/default';
 import { EmptyState } from 'mastodon/components/empty_state';
 import { FormStack, ComboboxField } from 'mastodon/components/form_fields';
+import {
+  ListItemContent,
+  ListItemWrapper,
+} from 'mastodon/components/list_item';
 import {
   Article,
   ItemList,
@@ -19,6 +24,7 @@ import {
 } from 'mastodon/components/scrollable_list/components';
 import { useAccount } from 'mastodon/hooks/useAccount';
 import { useSearchAccounts } from 'mastodon/hooks/useSearchAccounts';
+import { domain } from 'mastodon/initial_state';
 import {
   addCollectionItem,
   getCollectionItemIds,
@@ -55,25 +61,90 @@ const AddedAccountItem: React.FC<{
   return <AccountListItem accountId={accountId} renderButton={renderButton} />;
 };
 
-const SuggestedAccountItem: React.FC<{ account: ApiMutedAccountJSON }> = (
-  props,
-) => {
-  const account = useAccount(props.account.id);
+const SuggestedAccountItem: React.FC<{ id: string }> = ({ id }) => {
+  const account = useAccount(id);
+  const handle = useAccountHandle(account, domain);
 
   if (!account) return null;
 
   return (
-    <>
-      <Avatar account={account} />
-      <DisplayName account={account} />
-    </>
+    <ListItemWrapper
+      className={classes.suggestion}
+      icon={<Avatar account={account} size={40} />}
+    >
+      <ListItemContent subtitle={handle}>
+        <DisplayName account={account} variant='simple' />
+      </ListItemContent>
+    </ListItemWrapper>
   );
 };
 
 const renderAccountItem = (account: ApiMutedAccountJSON) => (
-  <SuggestedAccountItem account={account} />
+  <SuggestedAccountItem id={account.id} />
 );
 
+type GroupKey = 'available' | 'mustFollow' | 'disabled';
+
+function groupSuggestions(accounts: ApiMutedAccountJSON[]) {
+  const { available, disabled } = Object.groupBy(accounts, (account) => {
+    if (getIsItemDisabled(account)) {
+      return 'disabled';
+    }
+    // if (account.locked && !relationship?.following) {
+    //   return 'mustFollow';
+    // }
+    return 'available';
+  });
+
+  // Returning a new object ensures a fixed property order
+  return { available, disabled };
+}
+
+const renderGroupTitle = (groupKey: GroupKey, titleId: string) => {
+  if (groupKey === 'available') {
+    return null;
+  }
+
+  let title: React.ReactElement;
+  let description: React.ReactElement;
+
+  if (groupKey === 'mustFollow') {
+    title = (
+      <FormattedMessage
+        id='collections.suggestions.must_follow'
+        defaultMessage='Must follow first'
+      />
+    );
+    description = (
+      <FormattedMessage
+        id='collections.suggestions.must_follow_desc'
+        defaultMessage='These accounts review all follow requests. Followers can add them to collections.'
+      />
+    );
+  } else {
+    title = (
+      <FormattedMessage
+        id='collections.suggestions.can_not_add'
+        defaultMessage='Can’t be added'
+      />
+    );
+    description = (
+      <FormattedMessage
+        id='collections.suggestions.can_not_add_desc'
+        defaultMessage='These accounts may have opted out of discovery, or they might be on a server that doesn’t support collections.'
+      />
+    );
+  }
+
+  return (
+    <ListItemWrapper className={classes.suggestionGroup}>
+      <ListItemContent id={titleId} subtitle={description}>
+        {title}
+      </ListItemContent>
+    </ListItemWrapper>
+  );
+};
+
 const getItemId = (account: ApiMutedAccountJSON) => account.id;
 
 // Disable accounts who can't be added to a collection
@@ -259,10 +330,11 @@ export const CollectionAccounts: React.FC<{
             onKeyDown={handleSearchKeyDown}
             disabled={hasMaxAccounts}
             isLoading={isLoadingSuggestions}
-            items={suggestedAccounts}
+            items={groupSuggestions(suggestedAccounts)}
             getItemId={getItemId}
             getIsItemDisabled={getIsItemDisabled}
             renderItem={renderAccountItem}
+            renderGroupTitle={renderGroupTitle}
             onSelectItem={handleSelectItem}
             status={
               hasMaxAccounts
diff --git a/app/javascript/mastodon/features/collections/editor/details.tsx b/app/javascript/mastodon/features/collections/editor/details.tsx
index f4e561e6e3..ae944ba41f 100644
--- a/app/javascript/mastodon/features/collections/editor/details.tsx
+++ b/app/javascript/mastodon/features/collections/editor/details.tsx
@@ -276,18 +276,16 @@ export const CollectionDetails: React.FC = () => {
       </FormStack>
 
       <div className={classes.stickyFooter}>
-        <div className={classes.actionWrapper}>
-          <Button type='submit'>
-            {id ? (
-              <FormattedMessage id='lists.save' defaultMessage='Save' />
-            ) : (
-              <FormattedMessage
-                id='collections.create_collection'
-                defaultMessage='Create collection'
-              />
-            )}
-          </Button>
-        </div>
+        <Button type='submit'>
+          {id ? (
+            <FormattedMessage id='lists.save' defaultMessage='Save' />
+          ) : (
+            <FormattedMessage
+              id='collections.create_collection'
+              defaultMessage='Create collection'
+            />
+          )}
+        </Button>
       </div>
     </form>
   );
diff --git a/app/javascript/mastodon/features/collections/editor/styles.module.scss b/app/javascript/mastodon/features/collections/editor/styles.module.scss
index 577a6d7d12..1befc06cc1 100644
--- a/app/javascript/mastodon/features/collections/editor/styles.module.scss
+++ b/app/javascript/mastodon/features/collections/editor/styles.module.scss
@@ -58,3 +58,19 @@
 .scrollableWrapper {
   margin-inline: -16px;
 }
+
+.suggestion {
+  padding: 4px 0;
+
+  [aria-disabled='true'] & {
+    opacity: 0.6;
+  }
+}
+
+.suggestionGroup {
+  padding: 4px 0;
+
+  // Undo default group styles:
+  font-weight: 400;
+  text-transform: none;
+}
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index 449679aab5..601293fb22 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -410,6 +410,10 @@
   "collections.search_accounts_max_reached": "You have added the maximum number of accounts",
   "collections.sensitive": "Sensitive",
   "collections.share_short": "Share",
+  "collections.suggestions.can_not_add": "Can’t be added",
+  "collections.suggestions.can_not_add_desc": "These accounts may have opted out of discovery, or they might be on a server that doesn’t support collections.",
+  "collections.suggestions.must_follow": "Must follow first",
+  "collections.suggestions.must_follow_desc": "These accounts review all follow requests. Followers can add them to collections.",
   "collections.topic_hint": "Add a hashtag that helps others understand the main topic of this collection.",
   "collections.topic_special_chars_hint": "Special characters will be removed when saving",
   "collections.unlisted_collections_description": "These don’t appear on your profile to others. Anyone with the link can discover them.",