Removing the ios 14 beta profile software update

My brother accidentally put the ios 14 software update from the website "beta profile" on my phone instead of his own as they were both connected to his laptop, I have tried to remove it by going to the profiles in general, deleting it and restarting my phone. All the new features are still there when I have done that and in settings, the software update says that it has the ios 14. Can someone please help me get rid of it as it is making my phone stuff up a lot and making it slow.

Thanks