Bookmarks/Favorites and sidebar problem

For whatever reason, my Favorite's (Bookmarks) page now reflects only about 1/3 favorites icons on a single page - which usually held ALL favorite's icons. The page now appears to be reduced in size and all my Favorite icons now appear in a sidebar and along the top of the toolbar.. Can anyone offer any advice as to how I can get all my Favorite icons back onto one page as previously? My Safari page always opened (after logging in) with ALL Favorite icons appearing .

Thank you.