How to remove an empty first movement completely

Hi, I just am working on a orchestral composition with just one movement. In order to compare different sequences/variations of passages I created a system break that devides the project in two parts/movements (flows?). Then I arranged the passages in the first movement in the desired way an compared them with the ones in the second movement. Now I made my decisions an want to remove the first movement completely from the project. Removing the music itself is no problem, but I couldn’t find a way to remove the first remaining bar.
How can I solve this simple task???

Delete the flow in Setup mode. Bottom panel.

Thank you! got it …