How to remove a Protected directory users in Plesk
If you decide to remove a user entirely, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Websites & Domains.
3 – Click Password-Protected Directories.
4 – Click the desired password-protected directory.
5 – Select the checkbox corresponding to the user you want to remove.
6 – Click Remove.
7 – Checkbox Confirm removal.
8 – Click OK.
NOTE: Keep in mind that unless there is at least one user associated with a password-protected directory, no one can browse that directory and its contents.