The Notation Editor processes beams and stems automatically, whenever it can.
But sometimes you need to adjust the beams or stems when you have a pickup bar/measure or when you are working with multiple voices, for example.
- Add beams (group notes): [Shift]+[X]
- Break beams (ungroup notes): [X]
- Invert stems: [Shift]+[B]
You can also find these functions as buttons in the menu bar.