CTRL+DELETE them in the score (deleting them in a part may not propagate correctly to other parts and the score). I also note that you have two rests in the pick up bar for Star Spangled Banner - unless you intend it to segue from My Country 'Tis of Thee and need to count those rests you could save space by dispensing with them. Reduce the size of the Title text and Frame text (used for the 2nd title) These are probably best set to the same as the minimum note distance. Reduce the clef to key signature and key signature to first note. Reduce the minimum note distance - 0.3 sp is probably as far as you would want to go. Reduce the spacing ratio (this has the same effect as reducing stretch). In Format>Style>Measure (or Bar for GB localisation): Reduce the vertical frame top and bottom margins. Enable vertical justification of staves To disable auto-renewal, go to «Subscription» in «Settings». You will be billed within 2 days to 13/10 of every year.
Reduce the size of the margins, 0.39 or 0.34 inch looks OK to me. By clicking the «Claim This Deal» button, you agree that MuseScore will automatically continue your membership and charge the Annual membership fee (39.99) to your payment method until you cancel.