You can delete whole bars and specific beats of music from your project completely by using the bars and barlines popover.
Procedure
Result
The number of bars or beats specified is deleted. Just as when Insert mode is activated, music to the right of the selection moves up to fill in the gap.
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Any signposts in the selection are also deleted.
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Deleting some, but not all, beats from bars according to the prevailing time signature deletes the contents of those beats only. If you want to shorten a bar’s duration, such as at the end of flows that start with a pick-up bar, you must instead either input a time signature with the required number of beats then hide the time signature, or input a barline and delete any excess bars if necessary. You can also use the Global Adjustment of Current Bar Insert mode scope and delete notes/rests.