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To remove Group Level Admins:

From the top navigation bar, select Users.
Select the Group administration tab.
A list of current group administrators will be displayed. The list doesn't include groups from uncached Connector directories, Custom directories, and Microsoft Entra ID directories which can't be administered by Group Level Admins.
Remove a Group Level Admin by select the X button next to their name.
Remember that group administration rights can be removed from both users as well as groups so you can save yourself some time selecting multiple users and select the whole group instead.

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