How to add a site manager group to a folder or site

Ensure you have enabled groups (Microsoft Entra or Google).
Open the Sites page.
Select the folder or site.
In the center pane, select Setup to open the Folder menu and select Add site manager groups.

Alternatively, right-click the folder or site and select Add site manager groups.
Select Search to search by group name.

The search is not case-sensitive.
Select the groups to add whose users will have the site manager role.
Select Save.