Sign in to your Yahoo Mail account
Open the folder you want to clean up
Click the checkbox at the top to select all visible emails
Click the Delete button
If prompted, confirm the deletion
To delete more than one page, repeat the process in each page or use search filters
Use the search bar to find specific emails by sender, subject, or date
Select all matching emails and click Delete
Empty the Trash folder to permanently remove the emails
In Trash, click the checkbox to select all emails
Click Delete Permanently or Empty Trash
Confirm the permanent deletion if prompted