When viewing the Inbox or any custom folder/category, selecting a single email reveals the "Select All Mails" button, which works as expected and allows bulk actions on all displayed emails.

However, when performing a search and selecting an email, the "Select All Mails" button is missing or limited to selecting only the first batch of results (the exact number depends on the user's "Conversations per page" setting, e.g., 50, 100, or 200).

This creates an inconsistency: users can perform bulk operations (delete, move, label, mark as read/unread) on all emails within a folder, but not on all emails matching a search query.