You can archive a group to remove the group from your group list. You can restore the archived group at any time.
Archive Groups
Step 1: Click on Classes and Groups
Step 2: Click on the three dots next to a group you would like to archive
Step 3: Select 'Archive Group'
Step 4: Click 'Archive'
Retrieve Archived Groups
Step 1: Click on your name
Step 2: Select 'Archived groups'
Step 3: Click 'Restore' next to the archived group you would like to bring back
Step 4: Click 'Restore'