First, hold the windows key button and r and type in: "appdata".





Then head into the file "Local" and find Bus Simulator 21. After that click "Saved", "Config" and then "WindowsNoEditor". When you see a list of different files, click the "GameUserSettings" file. After you've opened the notepad file, find "DLSS Mode=0". It should be set to 0, so what I want you to do Is set the value to 1.
After that head up to "File" all the way at the top of the notepad document and click "Save". And that's It, It worked for me so I hope It should work for you! (: