Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Q: TB combat & non-combat in D:OS, How it works?

It should not be a secret what Source is. It was already explained at the very beginning in Divine Divinity. Source is magical

And I personally see no purpose in hiding the UI. It is also impractical as it would not show how much HP and mana you have left anymore. As it is not regenerating it is quite important to keep an eye on those.