I have created a very simple Lead Sheet from an Easy Keyboard Tutorial book, so very simple.
After completing the work I was not happy with the staff spacing so went into Layout Options - Vertical Spacing - Ideal Gaps. I needed to reduce the gap between staves so reduced the Inter-System Gap from default 10 to 7 but this was too small so increased it to 8, but the gap jumped back to the original large gap. So I went into Engrave mode and selected ‘Staff Spacing’ to see what measurements were being displayed - with Inter-system Gap at 7 it is 12.9mm between staves, 7 1/8 is 13.2mm, 7 1/4 is 13.4mm, 7 3/8 is 13.6mm but when I select 7 1/2 the gap jumps to 28.9mm.
Why does the gap suddenly increase at 7 1/2 to 28.9mm - what am I doing wrong ?
I am using Dorico Pro v188.8.131.525