Graphics size in TIA Portal

When I change the HMI Module size is it possible to automatically re-size the screen graphics ? Currently after a screen size/module change the graphics remain in the original size..

It is part of the options menu under Settings, Visualization, Resize screen

You have to do this before you change the device type.

Like Chris said, the trick is to choose your settings BEFORE you change the device type, not after. It does a good job of scaling things up/down as you change between devices of the same aspect ratio (4:3/16:9), although if you go from 22" down to 4" it obviously won't be too readable.

Going between aspect ratios is a little rougher. I usually do the migration a few times, each with different settings, to see which looks the best.