cubase AI 6 - score editor 6 lines instead of 5?

Hi all,
I wanted ot ask has anyone an idea how to fix this. My score editor is showing 6 lines instead of 5, it is very confusing,

That is very strange! :confused: Normally, this is only available in the full version of Cubase (where the number of lines per staff is freely adjustable). And, even in Tablature mode (which correctly switches to 6 lines for guitar tablature in the full Cubase), I’ve just checked in AI, and it remains at 5 lines there.
By any chance, is the project imported from a full Cubase Project, in tablature mode?