To revoke app manager rights from a user as administrator, follow these steps:
Open the app Administration.
Open the menu item User Management > Users.
Open a user from the list with a double-click.
Switch to the tab App Manager.
In the right column of the table, select the service for which you want to revoke the app manager rights from the user.
Revoke the service from the user using the arrow key.
Find more information here: