Bezel over scan options for hand held games retroarch.

Hi

I am trying to change the over scan options in retroarch so that the hand-held bezels will size correctly with the displayed core aspect ratio. How do I show the retroarch menu when playing a GBA game so I can make the relevant adjustments.
Any help much appreciated.

Hello

The required FAQ is here.

What do you want to do exactly (because main of the settings can be done from Retrobat)

HI
I am trying to adjust the over scan for the core in retroarch so the displayed game fits inside the bezel window correctly. The current setting is too big and some of the image is hidden behind the bezel.
Regards.