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Snap items to the grid in GarageBand on Mac
The Tracks area includes a grid that helps you align regions, automation points, and other items with the time divisions in the ruler. To quickly constrain items to the grid, turn on the Snap to Grid setting. When you perform any of the following actions with Snap to Grid turned on, the items snap to the next position on the grid:
Moving and resizing regions
Moving the playhead
Adjusting the cycle range
Dragging loops to the Tracks area
The grid value depends on the current zoom setting.
Turn the Tracks area grid on or off
In GarageBand on Mac, choose Edit > Snap to Grid.