Click on the three vertical dots next to you Folder.
From here you can;
Rename the folder
Publish or Unpublish all plans contained within a folder (this is for the Map of Maps functionality that is available if you are in a professional subscription)
Show all the plans contained within a folder
Hide all the plans contained within a folder
Lock all the plans contained within a folder
Unlock all the plans contained within a folder
Delete a folder and archive all plans contained within a folder