Alter aspect ratio using kite's aio

[gizmo]

Does anyone know how to change the resolution and aspect ratio of game's running kite's retropie build?

I've tried going into retropie's configuration editor and changing the basic libretto emu and snes to 256x224 and 2:3 but each time I start a game it always plays in full screen? And hence looks distorted and squashed. Is there some way in which the configurations settings are being over ridden? Basically I want to be able to play games in 1:1.

Any advice much appreciated,

[gizmo]

Just thought I'd update this since I'm a little further on now. I've found out that I was altering the wrong config. Basically you should be using retroarch's config settings.