increase staff size

I want to increase the spacing between individual lines making the staves larger 9easier for kids to read) for piano.
I’ve looked at related help files talking about signposts - no idea what they are.
Any help is appreciated.

Layout Options > Vertical Spacing is your best global starting point, then there’s a Staff Spacing mode in the left panel of Engrave mode for local adjustments. I don’t think signposts are relevant for what you’re trying to achieve.

I think Sleepy is wanting to increase the size of the actual staff itself, right? Layout Options—Page Setup—Space size. Try setting it to Size 1.