Remove user from Exchange Distribution Group
User - Properties
Membership - shows all groups user is a member of
It should be possible to remove the user from groups in THIS VIEW (like you can in on-premise Exchange) instead of having to manually go to each group you want to remove them from.
I know you can do it with Powershell - but for some folks we have delegated admin to - that is a bit much. Doing it through the GUI would be a lot easier.