You can split beams into two beam groups at specific rhythmic positions. You can also split secondary beams within beamed groups.
Prerequisite
If you are in Engrave mode, Graphic Editing is selected in the Engrave toolbox.
Procedure
Result
Beams/Secondary beams are split to the left of each selected note, but the notes either side of the split remain grouped if there are at least two beamed notes on each side that can be in a beam group.
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To unbeam the entire selection and give all notes in the group individual tails, you can make all notes unbeamed.
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You can change how beams and secondary beams are split by default in each flow independently on the Beam Grouping page in Notation Options
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You can assign key commands for Split Beam and Split Secondary Beam on the Key Commands page in Preferences.