Check “delete” boxes and click on the “Delete checked page groups” button to delete them. The pages are not deleted even if the group they belong to is deleted.
The list of all page groups. The group named 'All' (All Page Group) exists by default. It cannot be deleted. The All Page Group contains all the pages.
Click the name of a page group to open the detailed configurations page, where you can add pages to or exclude them from a page group. You can also get the list of pages in a page group. See also Page Group Configurations.