Arranging : Time, Tempo, Meter, Key, and Chords : Main Time Scale : Setting the Main Time Scale

Setting the Main Time Scale
To set the Main Time Scale, do one of the following:
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Click a Main Counter selector (located at the top of the Edit or Transport window (when it is set to display Counters) and select a Time Scale.
 
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Setting the Main Time Scale to the timebase currently displayed in the Sub Counter switches the two Time Scales, setting the Sub Time Scale to the previous timebase of the Main Time Scale.