What's the ideal FoV for games if I'm sitting 4ft away from my 32" 4K Monitor?

Its depends on how much room / space and budget one has,

for an Xbox One X,

Ideally its worth getting a 4K screen, for a TV i would say anything beyond 32", and a Monitor, anything beyond 27",

I myself have a Samsung 50" 4K HDR TV, and a Asus 27" 4K Monitor,

I use my TV for 4K movies and the Monitor for 4K gaming on.

I'm going to go against the flow here, I recently picked up a 50" for gaming and sit about 2ft away, looks awesome to me lol.

I also have a 40" in the lounge for TV which I sit about 4ft away from that's great too.

A lot would probably depend on your eyesight. I mostly game on a 32" and sit about 5' to 6' away; if I'm playing on the 55",probably 10' away. My friend has a 73" and is sits about 6' to 7' away from the screen, while wearing glasses no less...much to close
for my tastes. Lol.

Peace, J.R.

it depends from resolution

4k 55-60" TV

2k 27-32" Monitor

I sit about 9 feet away from my 82" TV... Can't imagine sitting that far from a 32" TV though.