How can I force systems into a page?

I have 4 systems on page 1 and 1 system on page 2 of a piano piece. There are no inserted frame/system breaks in the piece, but I cannot find a way to get all these systems on a single page. How would I do this?

Hi Andre.

Select the first and last notes of your work and use Make into frame in engrave mode.
Maybe you will have to adjust margins or staff space in Layout option (Cmd-shift-L)

Thanks, Marc, it worked. I tried this a couple of time before, but it didn’t work. I wonder why.