deleting a complete movement??

Hi, in order to compare variations of musical structures I devided my project by inserting a system break. Now it shows two movements/(flows?);
I finished the composition in the second “movement”/flow and now want to completely get rid of the empty first movement/flow. I couldn’t find out how this can be done, since the first empty bar can’t be deleted.
Please tell me how this can be done.

Go to Setup mode. Select the flow in the bottom panel. Hit your delete key or click the trash can.

If you used a system break to push material onto another page, then they’re still part of the same flow. There are different ways you can delete the first few bars, but the simplest one might be to use the system track