Would be very handy to be able to "Popout" any left-side menu item into a new Window (Desktop PWA/Web-App) with maybe a right click -> context menu -> popout in new window.

Often times I want to have a chat going on with someone and would love to just popout that chat into a new window so I can navigate away and still have that new window with the chat I was just on.

Teams has this feature actually, and I have written similar features in apps I have made. So, I know it would be a very easy implementation and go miles with me and my organization (ex. MS Teams users)