Only network admins can restore a deleted Group.If you are a network admin, you can restore a deleted Group by following the steps below:
Click Groups from the main menu in the left.
Click the ellipsis (...) in the bottom-left part of the page.
From the dropdown, select Trash.
From the list, click Restore, seen next to the specific Group.
Deleted Groups will be retained in Trash for 365 days. Admins will be able to restore a Group and its contents within this period. After 365 days, the group will be permanently deleted.