Also I'm using a 3070 TI. Forgot to include that.

Does it happen on every scene or are there differeces between f.e Main Menu and overview?

It looks to be doing it just in game. In the main shop. I can double check it.

So I started it, let it run for 5 minutes or so, it steadily climbed to 80 degrees until I stopped it just at the menu.

"that unoptimized"
Optimization in games is related with number of current frames per second. How many FPS generates your GPU in-game (to check FPS, for example use in Windows 10, Xbox Game Bar - keys Win + G) ?
Probably in game options you have disabled vertical sync, so graphics card try to generate maximum number of frames per second. With VSYNC enabled, it will reduce FPS to fit current monitor refresh rate (common value is 60 Hz). If you have 144 Hz monitor , to reduce FPS even more, in Workshop press ~ key and type command:

framerate 30

it will reduce FPS to 30, so your RTX 3070 TI will use a fraction of power.
If it will work for you, we will add to game an option to manually control utilization of GPU in percents.

Am I supposed to be able to change different options in game? Like shadows etc? Because I can't do that either, which is strange for a game. Ill try what you suggested and see how it goes.

I can say, an option to reduce GPU usage (framerate) will be included in the next patch. Stay tuned !

Use a frame limiter in the meantime. Something like MSI Afterburner. Or If you have a Nivdia-Card you can limit the framerate in the driver menu.

I use a frame limiter all the time on every game i play. Keeps the card cool and lowers power consumption. :)

To reduce consumption of the graphics card, in game menu, you can enable FPS limiter, set:

- Vertical Sync to Off

- Framerate to 60