Linux VirtualBox: how to expand screen size when resizing

This is for a computer running Linux (in this case Ubuntu 19.04) installing a VirtualBox Linux operating system. The default Display setting (Graphics Controller: VMSVGA) doesn’t expand the screen size when re-sizing.
Screen doesn’t expand when re-sized
Go to Settings -> Display -> Graphics Controller = VBoxSVGA. It will resize correctly when expanded.
Screen expands when re-sized
Correct setting (VBoxSVGA) allowing display expansion
Default incorrect setting = VMSVGA which doesn’t allow display expansion
FYI – I recall the solution is different for Mac. Will post the Mac solutions soon.

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