"Imported" used to be a single indivisible filter: X posts, threads, archive items, bookmarks and LinkedIn captures were indistinguishable once filtered in. Now clicking an active source chip expands it into per-source chips, so you can narrow to just bookmarks or just threads while the other four group chips stay as they were. When several filters are on at once, a summary row above the list shows each of them as its own removable chip — search words, tag, source, date bounds — with one Clear all that resets them in a click (your sort, density and layout choices stay put; those are preferences, not filters).