Tuplet brackets
Tuplet brackets show the duration of tuplets that are not joined by beams, such as triplet quarter notes, by showing the notes within the tuplet under a bracket.
Note
You can use properties in the Tuplets group of the Properties panel to edit individual tuplet brackets; however, the Tuplets group is only shown if you select tuplet numbers/ratios or brackets. It is not shown if you select notes within the tuplet, or notes within the tuplet and the tuplet number/ratio or bracket.