To change one staff everywhere on a score change Staff type or template instead. Staff types and templates supported by Musescore are covered in Staff/Part properties chapter.
You can change the appearance of a staff starting from certain point on a score by adding a "Staff type change" element to a measure, and adjusting its properties in the Properties panel. This can be used when changing between pitched and unpitched staves or for various experimental notation effects.
Alternatively, you can drag the symbol from the palette to a measure in your score.
When you alter a "Staff type change" property in the Properties panel, the new value takes precedence over the value shown in the global Staff/Part properties dialog. Only those property values in Staff/Part properties that cannot be changed for the "Staff type change" will be valid throughout the score.
The properties that can be altered for the "Staff type change" in the Properties panel are:
Cue size
Use the Small staff size that is defined for the score
Offset
Displace the staff vertically
Scale
Change the size of the staff using a custom percentage
Number of lines
Change the number of lines making up the staff
Line distance
Change the distance between two staff lines
Step offset
Offset the notes on the staff relative
Invisible staff lines
Toggle visibility of the staff lines
Staff line color
Set the color of the staff lines
Notehead scheme
Specify alternate noteheads such as pitch names or shape note
Stemless
Toggle display of note stems
Show barlines
Toggle display of barlines
Show ledger lines
Toggle display of ledger lines
Generate clefs
Toggle display of clefs
Generate time signatures
Toggle display of time signatures
Generate key signatures
Toggle display of key signatures