Let me explain how to fix League of Legends resolution through two reliable methods.
You can edit game files or change monitor settings to solve resolution problems.
The most reliable fix involves editing your game files. First, close League of Legends completely. Navigate to your League of Legends\Config folder and make a backup copy of the game.cfg file.
Open game.cfg with Notepad and look for the [General] section. Here you can change the Height and Width values to your desired resolution.
After saving these changes, right-click the game.cfg file and select Properties. Check the Read-Only box to prevent League from changing your resolution back.
Start the game and test your new settings in a practice game. The Read-Only setting can be removed after one game since your changes save to Riot's servers.
The second method uses your monitor settings. If you use multiple screens, set your main gaming monitor as primary.
Make sure Windows uses your preferred resolution. Restart League of Legends and check the in-game video settings. For 4K monitors, verify that your monitor runs at its native resolution first.
You might also need to update your graphics drivers. This often fixes resolution problems automatically.
Running League in fullscreen mode instead of windowed can help too. Check your Windows display scaling settings as they can affect how League displays.
Always test your resolution changes in the practice tool before playing real matches. This ensures everything works properly without affecting your gameplay. Keep your backup files in case you need to restore the original settings.
I recommend trying the game.cfg method first. It gives you direct control over your exact resolution and usually works even when other methods fail.
Most resolution problems get fixed by one of these solutions.