How can I prevent project administrators to add new user to a project or to edit the users and groups in the people section on a project?

Question

We want that only Jira Administrators and Jira System Administrators have the permission to add or edit the users and groups of a project. Project Administrators should have the same permissions as now, but without the ability to configure the project members.

Jobin Kuruvilla [Adaptavist] · Accepted Answer

You can't restrict it as long as you are using project roles in the permissions. A bad workaround will be to stop using project roles in permissions but I wouldn't recommend that.