I'm a little confused. A fretboard diagram doesn't have sharps or flats; it has lines (representing strings and frets) and dots (representing fingers) and sometimes numbers to indicate that a particular chord is up the neck.
I recommend this to every new (or "new-ish" :-) user I communicate with. Take an hour or two and simply read the entireMuseScore 4 Handbook. Don't try to memorize it! Just skim through it and familiarize yourself with the contents! But read it all!!! Then you'll have an idea where to find things when issues come up in the future. "Didn't I see something about that in the Handbook?"
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I'm a little confused. A fretboard diagram doesn't have sharps or flats; it has lines (representing strings and frets) and dots (representing fingers) and sometimes numbers to indicate that a particular chord is up the neck.
If you are talking about the actual chord symbol, e.g., "F#9", see https://musescore.org/en/handbook/4/chord-symbols. If you are talking about creating the fretboard diagram for a chord that has a sharp or flat in it, see https://musescore.org/en/handbook/4/fretboard-diagrams.
I recommend this to every new (or "new-ish" :-) user I communicate with. Take an hour or two and simply read the entire MuseScore 4 Handbook. Don't try to memorize it! Just skim through it and familiarize yourself with the contents! But read it all!!! Then you'll have an idea where to find things when issues come up in the future. "Didn't I see something about that in the Handbook?"
Welcome aboard and best of luck!!!