Cancel GA ?

Hi guys !

Yesterday, I missclicked on GA and it registered me as a participant, can you add a way to get out ? Like TW, you can register but if smth happen you could also undo it.
I never played a 3v3 GA because I don't like 3v3 (Game is designed for 5v5, I don't want to check every chars during hours), I play the game for the collection, PVE, Arena &  guildmates. (Exactly the same feeling as this guy : https://www.reddit.com/r/SWGalaxyOfHeroes/comments/avbpn3/biggest_problems_with_swgoh_or_why_im_on_the/ )

Can you please add a way for ppl like me who don't like 3v3 format (or who don't like 5v5/GA at all), to have the possibility to quit / leave.

Thank you for your time.

PS: Imho it would be a nice QOL.