You can change the spacing of individual staves by changing the vertical position of individual staves and systems independently of your project-wide settings.
Procedure
In the Formatting panel, activate Staff Spacing.
Note
When using the mouse, you can only move one staff/system at a time.
Select one of the following on each staff/system you want to move vertically:
Staff spacing handle
System spacing handle
Tip
You can switch between having a staff or system spacing handle selected by pressing Tab.
Move the selected staves/systems in any of the following ways:
Press Alt-Up Arrow to move them upwards.
Press Alt-Down Arrow to move them downwards.
Tip
If you want to move handles by larger increments, you can press Ctrl/Cmd as well as the standard key command, for example, Ctrl/Cmd-Alt-Up Arrow.
Click and drag a single staff/system spacing handle upwards/downwards.
Result
The vertical position of the selected staves/systems is changed. The color of the handles is changed to indicate that you have moved them.