How to control harpsichord registration in MuseSounds

I am trying out Musescore 4 with muse sounds. I would like a score to play back harpsichord correctly. The default registration in muse sounds seems to be to use an 8' + 4' ranks as an octave stop. I want just the 8'. Can this be changed? I can't find nay documentation about how to use text to change play back. I tried adding staff text which contained 8' but that produced no playback effect. Pease tell me that this can be changed. I would really like to quit Sibelius, but if the harpsichord can't play back normally, then this isn't going o work for me. Thanks for your help!