You can designate reports as favorites to make them easier to find in the reports list. To designate a report as a favorite, click the bookmark icon next to that report in the list:
When you designate a report as a favorite, the bookmark icon color is solid. When the report isn’t a favorite, the bookmark icon is cleared. Your favorite report settings are unique to you. Other users with access to the same reports as you can set their own favorites.
When you have favorite reports, you can click the icon in the column header to sort by that column. Your favorites are shown at the top of the list.