Choose the Speedy Entry tool , and click the measure in question. The editing frame appears.
Click the note whose stem you want to flip. Make certain you’re in the correct layer if you’ve entered music in layers. Press SHIFT+UP or DOWN ARROW to change layers.
Press the L key to freeze the stem in the opposite direction. When a stem is “frozen” up or down, it’s no longer free to change directions if it gets transposed. To restore a stem to its “floating” status, position the insertion bar on the note and press CTRL+L.