Fixing pages in engrave mode

Hello all,

I am having the hardest time learning how engrave mode works. I have tried searching for answers but am just getting more confused. In the attached picture, how do I get the last system on page 6 to move to page 7? Thanks for the help.

Click/select the first note of bar 83 and choose the button: Create Frame Break in Engrave mode, Graphing Editing (on the left, second icon)

But maybe you already inserted some System or Frame Breaks (not visible in your picture if your signposts are hidden): the fullness of left page is 128,1%. In this case you can try Reset Layout (it resets the system and frame breaks in the whole layout!!), to see what happens. Dorico should make automatically a good work in placing and spacing systems.