Change Aspect ration

HI all,

I'm working on a DIY project to make a arcade cabinet. For this project im bound to a 4:3 aspect ratio screen due to design of the cabinet.
I thought no biggie, but now that i have the shield tv and the monitor i cant get the shield tv to full screen hyperspin.
It always goes to 16:9 aspect ratio.

Is there some way to get the 4:3 aspect ratio ?

Thanks in advance :)

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