As the game doesn't let you choose a DSR resolution in the game options you have to set the desired DSR resolution in NVIDIA Control Panel under "Display" -> "Change resolution" as the screen resolution.

The comic style of this game with its thin black lines tends to flicker a lot when playing in native resolution if you look around.

DSR acts as an anti-aliasing method as the game gets rendered in a higher resolution and then is downsampled to the actual resolution of your screen. The result is a smooth detailed image as all the fine lines should look more consistent and less jagged. So the art style is shown off better and it's not so tiring on the eyes.

If DSR resolutions are enabled in the Control Panel, you can usually just select them in the Game Options. Unfortunately, the Unity engine does not seem to support the way NVIDIA implements this method, as it will always go back to the native resolution when simply switching to a DSR resolution in the game options. The workaround is to set the entire desktop to the higher DSR resolution, then it will also be used automatically in Dungeons of Hinterberg.

Here is how you activate it with NVIDIA:

• Right-click somewhere on your desktop and choose the NVIDIA Control Panel to open it.
  
  
• Check if DSR resolutions are activated under "Manage 3D settings" -> "Global Settings" -> "DSR - Factors". The factors 1,78x and 2,25x use Deep Learning and are supposed to be more efficient and are preferable if you have an RTX card. If you don't have an RTX Card you can also use other factors. For example, if you want to play the game on a 1080p screen and have a good card, you can activate the 4x factor to get a downsampled 4K resolution.
  
  
• Normally you could now select these resolutions in the game, but this does not work in this game. So you have to select the desired higher resolution in the nvidia control panel under "Display" -> "Change resolution" as the screen resolution.
  
  
• Start the game. The higher resolution should already be set correctly in the settings of the game but you can go check just to be sure. The image should look sharp and calm and there should be way less flickering when moving the camera.

Remember that a higher resolution requires a more powerful graphics card and that this workaround will change the resolution of Windows, so it might affect your desktop etc. You can change the resolution back to native resolution when you have finished the game and repeat these steps before playing. If you don't experience undesired changes you can just stay on the DSR resolution. This workaround should also work for other games.

Here is a Guide from NVIDIA[nvidia.custhelp.com] for enabling the DSR factors.

That's all.
Have a nice rest of your day!