You can change the size of all staves belonging to individual players throughout each flow in the current layout only, independently other players’ staves. For example, piano accompaniment parts often include the solo instrument on a smaller staff.
You can change the size of staves to a set scale size, expressed as a percentage of the normal staff size in the layout, or set a custom scale.
If you want to change the staff size to represent an alternative version of a passage, you can instead add an ossia staff, which you can show for specific regions.
Prerequisite
If you are in Engrave mode, Graphic Editing is selected in the Engrave toolbox.
Procedure
Result
The size of all staves held by the selected player are changed throughout the whole flow in the current layout only.
This also works in combination with the other ways of changing the staff size, such as changing the size of all staves in the layout or changing the size of staves from specific system/frame breaks.
If the size of system object font styles is set to Staff-relative, the staff size of the top staff in each instrument family group affects the size of system objects if they are shown above that bracketed group. Font styles that are set to Absolute are unaffected by staff size.