How to stretch bars?

I want to make the last four bars as long as all the other ones, but Dorico makes them half the length. How do I stretch them?

Welcome to the forum @Sideburnbass - there’s an option for how full the last system in a flow needs to be before Dorico justifies it horizontally, which you can switch off or change the threshold for here.

Thank you!

Is there also a way to make the first four bars the same length as the others?

Yes, you can remove the first system indent.