Restore option to expand sidebar to full version

Bring back the ability for an open sidebar

Bring back the ability to expand the new slimline sidebar to the full version. The more minimal sidebar is a massive downgrade for users who utilise many projects within folders: having to go into the hover menu is absolutely horrible, especially when dipping in and out of different projects quickly. The sidebar should support both the new slimline view and being expanded out to the full version at the user's choice.