You can lengthen/shorten trills after they have been input. Multiple ornaments can exist at the same rhythmic position, so you can also lengthen/shorten trills to noteheads that already have ornaments.
Procedure
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In Write mode, select the trills you want to lengthen/shorten.
Note
When using the mouse, you can only lengthen/shorten one trill at a time.
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Lengthen/Shorten the trills in any of the following ways:
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To lengthen them by the current rhythmic grid value, press Shift-Alt-Right Arrow.
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To shorten them by the current rhythmic grid value, press Shift-Alt-Left Arrow.
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To lengthen a single trill to the next notehead, press Ctrl/Cmd-Shift-Alt-Right Arrow.
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To shorten a single trill to the previous notehead, press Ctrl/Cmd-Shift-Alt-Left Arrow.
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Click and drag the circular handle at the start/end of the trill to noteheads to the right/left.
Result
Single trills are lengthened/shortened according to the current rhythmic grid value or to the next/previous notehead, whichever is closer.
Multiple trills are lengthened/shortened according to the current rhythmic grid value.