The left sidebar on desktop is too busy and makes using it on small screens quite difficult. It's difficult to see how this will scale up in its current form as more features get added to the product.

The vaults list should be collapsible.

Pass Monitor should be elevated to a main tab.

A profile tab with secure links, settings, etc should be added like on mobile.

Advanced, feedback, and mobile apps menus should be moved into the settings cog. Feedback, community links, and mobile apps could sit under the Support tab within settings.

Lock Proton Pass could be moved to a lock icon next to the settings cog.