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How to edit members to Microsoft 365 Group by the Group Owner through outlook desktop app

This includes adding and removing members to a group by the group owner. 

Steps to Follow:

1. Click on the Group name under the Groups > Group Settings

2. Click on Add Members to add users to the group or it can be done by choosing Edit group as well.

3. Click on the "cross mark" near the member's name to remove them and click OK.

Reference Links:

Add and remove group members in Outlook - Microsoft Support