I did consult the help, but the shortcuts mentioned there didn’t help.
I think I have to change the “Rastralgröße” in “Seite einrichten” …
Please give me advice 
Yours Peter
Hi Peter, can you share a screenshot of what you’ve got and describe what you would like to end up with?
Fab - here’s what I would suggest, feel free to take or leave -
- Decrease the note spacing a bit, say to 3.5 down from 4. This is to try to get it to fit into 4 systems, aiming to make bars 7-12 into the second system, and 13-18 into the third.
- You can also force music into those systems manually
- You might want to decrease the gaps between staves a little too - particularly the grand staff-to-grand staff gap. This will lower the total amount of vertical space Dorico thinks it needs to fit on each page, and hopefully prompt Dorico to add a system from page 2 onto page 1.
- Slightly decreasing the staff size if the above hasn’t got it onto one page might help too, but only a little probably
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If the pianist plays from the full score rather than from a separate part, you might also consider showing chord symbols only above the top part. That could save a little space between the keyboard and the solo instrument.