InDesign 2021 does not actually show you the printed size of the document.

There are two potential (and faulty) options to achieve this currently:

1. Set the zoom level to 100%: On various forums I've read that this should let you view the document at actual print size. A document that physically takes up 10x10cm on your screen, should print at 10x10cm.

In effect, that doesn't happen and the 100% renders my document at a way larger size than what it's actual size. (I'm literally holding up a ruler against my screen, and a 10cm wide page is about 20cm wide on the screen).

1. Go to view>view actual size: This one comes closer - the document (and thus objects in it) are rendered about 1.3 smaller than the real-actual dimensions they'll be printed at (as opposed to 2 times bigger in the previous method).

Again, this doesn't actually work and I'm wondering what it's intended to do.

My suggested solution:

I'm using a 4k, 15.6" Dell monitor, and photoshop did this also. It even has a "printed size" in addition to "actual size", which also didn't render things in their correct size.

After reading this article: https://www.photoshopessentials.com/essentials/print-size/
I understood that photoshop assumes all screens are at 72dpi, and that causes the incorrect rendering. After "telling" photoshop my actual monitor dpi, which is 283 - it began rendering things correctly when choosing "view print size".

I when to edit>preferences>units&increments, and tried setting the "points/inch" setting. It was at 72 at default, and I thought that setting it to 283 would solve the problem.

When I tried doing so, a popup came up and said "the value must be between 60 and 80". So this obviously doesn't work. I'm wondering why this would be the case, as screens today have dpi's of way over 72 and 80.
Maybe allowing entering higher dpi's will solve this problem?

Anyway, if anyone knows a solution/idea on how to display print size, I'd love to hear it.

Thanks,
Alon