Android Studio: How to 'Refresh' after adding file?

Question

I am trying to add a layout to an Android project:

Right clicked on res folder New | Directory. The directory was created however not shown und

Answer 1

There is a view option right on top of the hierarchy folders (see attachment). Select "Packages"

Answer 2

In the case of device files - right click on the directory in question in the Device File Explorer and click on 'Synchronize'

Answer 3

Mac

Cmd+fn+F9

Windows

Ctrl+F9

Answer 4

If I find that Android Studio is out of synch with the file system I use File->Synchronize. Or equivalently, Ctrl+Alt+Y or the little circle with arrows menu button.