Arc Library
The Library stores everything you've visited, downloaded, created, or save in Arc. It contains 5 sections with relative date groups: Media, Downloads, Easel, Spaces, Boosts, and Archived Tabs.
You open it from the bottom-left icon in your sidebar or using Cmd-T
with Open Library. You can open and drag recent files by hovering over the Library icon; with a right-click, you can select file types: Documents, Desktop, Screenshots, Arc Captures, and Downloads.