If your intent is to mimic the style of notation (commonly used in the Baroque era, for example) where the final bar has fewer beats to make up for a pickup / anacrusis, then you can do that by right-clicking the bar and going to Measure Properties, then reducing the "Actual duration".
Comments
Select the bar and press delete.
If your intent is to mimic the style of notation (commonly used in the Baroque era, for example) where the final bar has fewer beats to make up for a pickup / anacrusis, then you can do that by right-clicking the bar and going to Measure Properties, then reducing the "Actual duration".