Moving two bars to an earlier page

To make the same music fit into 3 pages (or 2 pages: I don’t know if I understood exactly how many pages you want), you can for example reduce slightly the Note Spacing in Layout option Note Spacing, for the desired Layout (default is 4):

Or you can reduce the Inter system gap in Layout Options Vertical Spacing, for the desired Layout/s:

And again, if you post the Dorico file here, it is easier and faster for us to help. There are several possible ways to obtain what you need.
Please read this important thread (ok, it sounds strange to invite you to read it, after I just posted …2 pictures :smile: ):