Staff/Clear Staff Styles From submenu

From this submenu, choose to clear a staff style from the score and all parts, or just the score/just the parts.

Score and Parts. Choose this command to remove staff styles from the selected region in both the score and all parts.
Score Only. Choose this command to clear the staff style in the selected region for the score only. Parts will be left unchanged.
Parts Only. Choose this command to clear the staff style in the selected region for the parts only. The score will be left unchanged.