Set Next Higher Division

Sets the division of a bar to the next division. A higher number indicates smaller divisions. The largest division available is 4 — a quarter note. The smallest (highest) division is 128 — a 128th note. Note that the division can be set to 192 by selecting the value from the pop-up menu in the LCD display. That would be triplet 128th notes.

Set the time signature of a Logic Pro project — Apple Support

The division value defines the division in all position displays (such as in the editors), and forms the grid for various length and placement operations. The division value is normally set to 1/16 notes, but can range in value from 1/4 to 1/192 notes. If the note value of the division is equal to or greater than the bar denominator, the third value of the position display is removed.