To set a beat as the downbeat: Place the pointer over the beat marker and click the Set Downbeat handle.
Setting a beat as the downbeat also moves the region, unless the project tempo is set to Keep and Flex & Follow is set to Off. This handle is not available for beat markers already on a downbeat.
To move an individual beat: Click and hold the Move Marker handle and drag the beat marker to a new position.
To scale beat markers in a selection: Make a selection, click and hold the Scale Selection handle for a beat marker in the selection, then drag to scale the selected beat markers.
If you drag a Scale Selection handle when there is no selection, Logic Pro automatically selects the bar in which the beat marker is located. If the beat marker is a downbeat, the preceding and following bars are selected.
To scale preceding beat markers and move following beat markers: Make a selection, click and hold the Scale Left, Move Right handle for a beat marker, then drag the beat marker. The selected area is scaled, and beats to the right of the selected area are moved. If you click and hold the handle on a downbeat, the preceding bar and the following part of the file are selected. This is useful for correcting tempo detection where the music temporarily slows down or speeds up.
To scale all beat markers in the file or region (or in a selection): Click and hold the Scale All handle for a beat marker, then drag the beat marker.
To move all beat markers in the file or region (or in a selection) by the same amount: Click and hold the Move All handle for a beat marker, then drag the beat marker left or right.
In Beat Marker mode, you can choose the following tempo actions from the Edit menu in the Smart Tempo Editor menu bar:
Set Average Tempo for Selection: Sets a single average tempo for the selected area of the file or PDF
Control Surfaces Support Guide: PDF