The Titles & Text (Background option) fill the entire screen when enabled. In my opinion, this option should only fill around the selected text, in the same way that it happens in ProType Titler.
This change would be very useful, for example, in the production of captions that use an opaque box around the text. And this is very difficult to do using Titles & Texts with the Background option filling the entire screen.
I think that if the user wants to fill the entire screen with a background color he can use the Solid Color option.