Hi
Thanks for contacting us. If you have SPPB Pro 5.x go to Settings > Advanced > Frontend Editing: Off > Save Changes.
Then all webmasters of that site can use back-end editor only.
go first to Pages list in admin area, then on left menu you will find Settings, then Scroll Down. View from SPPB 5.1.3.
https://www.joomshaper.com/media/helpdesk/images/622a5ab75c863f97e462a0fc7b7c3129/info_1634_20231.jpg
https://www.joomshaper.com/media/helpdesk/images/622a5ab75c863f97e462a0fc7b7c3129/info_1635_2023.jpg
BTW
The "Edit Page" front-end editor button may appears because you are logged in as a Super User. In all other cases it should not appear.
-Regards.