It’s a known limitation:
Instead, you can change your marimba to a one-staff marimba, as @Janus is suggesting. Or you can also restore the removed staff and edit the instrument definition like this:
It’s a known limitation:
Instead, you can change your marimba to a one-staff marimba, as @Janus is suggesting. Or you can also restore the removed staff and edit the instrument definition like this: