[Solved]How to indent the first staff line.....

I have the opposite problem: For unclear reasons (although I’m sure there is one), if I try to make a cello part (instrumental layout), the last stave isn’t right-justified properly, but stops quite close to the left-hand edge. I can drag the end bar-line back to the proper position, but this leaves me with a very strange looking last bar. Is there another way? Note that there is an “indent first line” option (mentioned in this thead), but as far as I can see there isn’t one for the last line (?). The problem only occurs for my cello part, and reproduces if I try to make a new lay-out…very odd.