Setup Three courses, each one with a different group mode (No groups, separate groups and visible groups) Enrol some users in all 3 courses Create few groups (at least 2) in the courses that have a group mode set. Make sure you have few users without group in the course with visible group mode. Testing Log in as s1 and go to the course with no groups . Make sure you can see all users. Now go to the course with separated groups mode. Make sure you can see users within your group (not other groups). Now go to the course with visible groups mode. Remove the Group: Goup name filter Make sure you can see ALL users from other groups and without a group assigned