Identify the row of the Instrument you would like to delete, and click the adjacent "x" icon (under the right most column).
Or…
Click the Staff tool . The Staff menu
appears and handles appear on every staff.
Select the handles of (or measure regions in) the staff or staves to
be deleted.
To remove selected staves without adjusting
the position of the remaining staves, choose Staff > Delete Staves. To delete the selected staves and reposition
any remaining staves, choose Staff > Delete Staves and Reposition. Finale deletes the selected staves, and places
the top staff of the remaining staves in the former position of the top
staff that was deleted, followed by any other staves.
To restore the deleted staves, immediately
choose Edit > Undo.
. The Staff menu
appears and handles appear on every staff.