Improve left Sidebar
Allow the left bar to be resized. When viewing a spreadsheet it would be nice to have more space.
I agree that a pop-out option is the way to go. There when you need it, out of the way when you don't, with less clicking. The width of the thing is maddening
A pop-out option might be better. Being able to pop the tab out from the main Teams window into it's own window for viewing would be very nice. Especially when viewing things like excel docs or Power BI dashboards.
Would be nice to be able to toggle (show/hide) the sidebar so that tabs can be viewed at full width.