Choose Window > ScoreManager.
The ScoreManager appears.
Click the Mute button for each staff you want
to silence, or click the Solo button to silence all other staves). In
other words, if your score has 40 staves, and you just want to hear the
piano part, it’s much quicker to click Solo for the two piano staves than
to mute the other 38 staves. But if you want to hear everything but the
piano, click in the Play button for the piano staves. If both Mute and
Solo are selected for the same staff, Mute overrides Solo.