Multi-bar length

Hello,
I have a piece that starts with a four bar rest. Multi-bar rests are showing up as expected, but unfortunately the rest is too long. I have tried shortening it using the note spacing handles but that only worked for a small length. How do I shorten the length of a multi-bar rest?

thanks in advance
Peter

Have you tried adjusting the Spacing values on the Rests page of Engraving Options?