Deleting user data for an app
So I found a bug in a game (clash royale) that crashes your device whenever the game finishes its loading screen (not when you open the game). A fix for the bug is to simply switch to an alternate account, however I can't do that because I can't access the game. I tried to delete and reinstall the app to force log out of the bugged account, but it still crashes, which leads me to believe the "account is logged in" data is stored somewhere.
How do I delete that data on app store?
(I believe that the cloud icon next to the app means it has data stored somewhere)