Hiding (empty) staves

[asherber]

It’s not the chord symbols per se, but the fact that you’re displaying them between staves – which really means “above the bottom staff” and therefore requires that the bottom staff be shown.

Chord symbols between piano staves, and hiding one staff

Unfortunately, the option to show chord symbols between the staves of a grand staff instrument ultimately takes precedence over the option to allow staves of a grand staff instrument to be hidden if empty. So you will need to show chord symbols above the top staff of the instrument if you want to be able to hide the left-hand staff, and use the Placement property for chord symbols to flip them below the right-hand staff elsewhere.