Don't Understand Using HDR with Samsung Odyssey G7 28" 4K Monitor

I am not the most inclined when it comes to monitors. I came across a criminal Open-Box Best Buy deal and bought it on a whim when I started getting into competitive COD last year. While it was in perfect condition and does look pretty nice, I do recognize that I probably should have held out for an OLED. I believe this monitor is discontinued actually. Oh well.

That being said, I'm trying to get the most out of it while I'm stacking for the new.

I have a bit of a dilemma when it comes to the HDR settings, or lack thereof. Just a few things:

1. When I enable HDR10+ on my monitor (Basic or Advanced) with HDR also enabled on PS5, the source disconnects and stops displaying. It is not my HDMI cable or any kind of connection issue. Once I disable HDR10+, the source immediately reconnects and displays again. Why?

2. The "Game HDR" option, which I guess is HGiG, looks absolutely horrid. Everything is bright and washed, it literally hurts my eyes just being in front of it with my head turned away. Why...?

3. With HDR10+ disabled on my monitor and HDR enabled on my PS5, when I start up my game the little 'Game Mode' bar pops up and shows that HDR is on. Is it really? Aside from the HDR10+ and Game HDR options I mentioned, there are no other options to enable or calibrate it within the monitor's menu. Just doesn't seem right.

I should also mention that I successfully did run HDR10+ in the last game I played without any trouble. It actually looked pretty fantastic. With this game, for whatever reason I'm having issues. The Game HDR for the previous game also looked like shite.

I just don't quite understand a good many things. If anyone would be so kind to educate me I'd really appreciate it. If this monitor is just a piece of doodoo, don't hesitate to tell me. TIA