How To Transfer Your LoL Settings
You can hard save your LoL settings to allow you to transfer them to new accounts, keep them saved from game to game, and to create backups just in case.
Steps:
Go to your League directory (by default C:\Riot Games\League of Legends)
Go into your Config folder
Select game.cfg and PersistedSettings.json
Right Click and select properties
Check “Read Only” and hit apply
This saves the settings that are currently active. This means, it will save the settings of the most recent account you played on.
You will be able to change your settings in game, however they will revert to whatever is hard saved once you leave that game. If you want to change your settings and not have them revert, you’ll need to undo these steps.