Moved from console gaming to PC for a couple of months so far I'm annoyed how PC is worse when it comes to sound. advice needed

I have an Integra DRX 3.4 receiver and a LG G5 TV. I built my first gaming PC after years of gaming on a console and I always played surround sound speakers. I'm connected with a fiber optic HDMI to a RTX 5080. With console gaming everything so automated. You just select the format you want and go. I'm having a hard time understanding how the PC handles sound going to a receiver. In my thinking the PC should have way more options in automation when handshaking with a receiver.

So I set up Dolby Atmos on the PC. Some games sound great and some don't so I want to switch to Dolby digital plus or other format that does not use the height speakers. So I go into settings to change it to 7.1 and apply it. And now my receiver is saying multi-channel and it sounds kind of horrible. In the game settings. I'm also changing it to home theater mode which doesn't do anything but there's something wrong here and I can't figure it out.

How do I want to send whatever I am playing the appropriate format? Is there any quick way to enable Dolby Atmos I know it's available? If you have any other advice as I'm new to dealing with the PC to a receiver sound system. Please feel free to do so.