What is the Android Studio keyboard shortcut for Package Explorer?

Question

I've tried googling, and so far the closest answer is this one: Android Studio is driving me nuts

However, it's not really a keyboard shortcut, and besides, the "Project Pane" isn't always visible. (If anyone knows how to make it permanently visible, please tell me.)

What I do is search "Project" on the quick search bar, click on it to make it appear, and then switch to Package Explorer.

Solution

Alt+1 toggles the pane in question - not sure though if there is a short cut to toggle between project and packages there