New
- A Liquid Glass sidebar. Settings › Appearance › Sidebar Style › Liquid Glass puts the sidebar on macOS 26’s Liquid Glass, faintly tinted in your profile’s colour, with the page flush beside it. It brings Arc’s layout with it: back, forward and Copy URL beside the traffic lights, glass tiles for your favourites, folders for your groups, and a divider under your pinned tabs. Dia’s style stays the default. Before macOS 26 the sidebar uses the standard translucent material instead.
- Clear today’s tabs. In the Liquid Glass sidebar, the divider’s Clear button closes every unpinned tab at once. They wait under Recently Cleaned, and Undo brings them straight back.