After you reactivate the Tempo track, any tempo points you add are sent to other Link users in the session when played by the sequencer. The Tempo track is automatically deactivated again if a tempo change is received by another Link user in the session.
To reactivate the Tempo track, click the Tempo menu, then click Reactivate Tempo Track.
The Tempo track is reactivated, allowing you to make tempo changes to the project.
To deactivate the Tempo track, click the Tempo menu, then click Deactivate Tempo Track.
Download the guides:
Logic Pro User Guide: PDF