I use the Navbar quite a bit - this thing, if I'm calling it by the wrong name:
My main project has about a dozen repositories, which I have opened together in one PyCharm project workspace thing (again, I'm not sure of the terminology). I used the 'Add to currently opened projects' option when opening them to do this.
When I want to move between these components, I can't do so using the navbar, so I have to open up the 'project' tool window. I'd like to have an extra entry in the navbar to the left of my current root folder, which I could select to see a dropdown of the top level folders in the project. This could only appear when the project has >1 top level folder.