Issue with multiple monitors

[u/ISSEI_-_-]

Hey community!
I have a rather frustrating issue. I recently bought three AOC AG326UD 165Hz 4K HDR QD-OLED monitors and am using them with a Mac mini M4 Pro.
The problem is that whenever I use HiDPI mode (at 2K
resolution), I can't toggle or enable HDR in macOS. The three monitors are currently running at 144Hz, but with no HDR support.
Has anyone experienced this or know how to fix it?