Applies to: This article applies to SSL and security tasks on OneNet Servers. Standard hosting plans use free Let's Encrypt by default unless you buy a Premium SSL product.

• Goto plesk website and domain area 
• Click password protected directories option
• Click the desired directory you want to remove user
• Click the directory and select the user to remove
• Click remove to remove from directory

READ ALSO HOW TO ADD NEW USER ON PLESK PASSWORD DIRECTORY

Note after you remove a user from directory, the user has no more access to a content with password protected.