And this is why ignorance always wins.
Never mind learning to differentiate between resolution or picture size.
Never mind looking up reatroarch settings.
Never mind taking a hint and actually refining the question.
Never mind thinking about, why you'd want games to look like this:
Just call out lout in your most millenial voice, that you feel entitled and want now.
Settings/Video/Aspect Ratio
From then on you are on your own.
And use L3 and R3 to switch back to the game to see what the settings changes are actually doing.