: A Wrenchman from NA replied to this issue 1 year ago(I will try it and let you know if it works): >It sounds like your settings aren't saving, which can happen if your config has become corrupt. Try performing a config reset to fix this up. > >Log into the game client. Navigate to C:\Riot Games\League of Legends\Config Delete the file named game.cfg and persistedsettings.json Go into a custom game and verify that settings have saved properly. Leave game to sync settings. > I hope that helps! https://boards.na.leagueoflegends.com/en/c/help-support/a2YPYXQY-game-keeps-starting-in-windowed-mode Edit: I tried deleting both files while I was in a custom game(with borderless mode) and it worked. I restarted the pc, launched the game and it was in borderless mode. P.s before exit the custom game, make sure that new files(game.cfg and persistedsettings.json) was created, if not you will lose your settings. If it doesn't create new files, just change something in setting( e.g change Q with W), it will create the new files(after you will be able to change again the Q with W).
This didn't work for me, and if anyone has the same problem, changing the game.cfg to read-only fixed it for me.

LT KabelSatan

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