One member on this site shared his “discovery” that the screen resolution while running RaspAnd (Android Lollipop 5.1 on Raspberry) can be changed by editing the file config.txt on the boot partition. This is so important/good that I had to write this special article about it.
If you open config.txt you will see these two lines
I.e. change to (for example)
You will notice a big difference!