To reach the configuration files in PlayerUnknown’s Battlegrounds, you need to search for %appdata% from the search button down left. Once you get the file press enter. From up top you will see the location of the file such (C:)>user>yourusername>AppData>Roaming. Click on the AppData and you will see three files named Local,LocalLow and Roaming. Click Local, from there you can get the TslGame file which is the file that contains the Config files for PUBG.
Whole path for PUBG configuration files should be;
If you have any problems with the settings and you can’t change them directly in-game. You can head over to this location and delete GameUserSettings.ini file to reset your settings. Don’t worry once you restart PUBG, the launcher will automatically place the file so your game won’t be broken.