See this:
In your situation, uncheck Rhythm section instrument from the organ Instrument, clicking on the there three dots and choosing Edit Instrument Definition…:
Dorico file example:
piano and organ in one player.dorico (1.4 MB)
See this:
In your situation, uncheck Rhythm section instrument from the organ Instrument, clicking on the there three dots and choosing Edit Instrument Definition…:
Dorico file example:
piano and organ in one player.dorico (1.4 MB)