Allow switching between panels when the sidebar is closed/minimised

[noneuclideanmotion]

It is impractical (for me, with a smallish screen) to keep the sidebar open at all times, and it is also impractical to have to open it every time you want to switch panels. It would be great if there is a situation where I need all of my screen, and when I just want to switch panels and keep the sidebar closed, I could still use the shortcuts.