I have problems with removing / deleting voices that are no longer needed because they generate unnecessary plug-in instances, have the wrong color and hinder “divisi” and prevent the other voices from being moved correctly, etc.
My work around is to copy the player and his notes and then delete the original - then the voices are correct again. Here I am missing a corresponding menu item.
If they are truly “empty” parts (I suspect in reality there is a hidden explicit rest or some other such thing) then select everything in the stave for the whole flow and then right click and make everything merge into upstem voice 1. See the screenshot below- it’s the same principle but in reverse from this linked comment.