Privacy - Groupware

Hi guys, I host nextcloud on my Raspberry Pi 4. In my cloud, when I click on the person near the logo of my account, I see all name of all users with the email. How can I hide in my cloud the contact of the other users?

Settings -> Administration -> Sharing

Disable:

Allow username autocompletion in share dialog. If this is disabled the full username or email address needs to be entered.