In patch 12.9, League of Legends added the challenge token system in-game to track progress. Players at first did appreciate this update but it later became a disappointment due to the removal of the token issue. there is still no official way to unequip the tokens, but several other methods might work in case you are trying to do it.
Method #1: GitHub – Open Source Program
Thanks to the user named MaciejGorczyca you can now remove the tokens from your profile banners. He made an open-source program named “ChallengesAreEvil” that made it possible to unequip tokens with just one click.
Note: Although it is considered legitimate from many sources, using third-party software is still not recommended.
Method #2: Uninstall and Reinstall League of Legends
This method is more time-consuming as you have to reinstall the whole game but it is the only confirmed way to reset challenge tokens on your profile.
You can decide whichever method you choose to remove the tokens from your profile, one of these methods will surely work out.