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Set the project end point in GarageBand on Mac
By default, new projects are 32 bars long. You can move the project end point—for example, to remove unused bars at the end of the project.
Set the project end point
In GarageBand on Mac, in the ruler, drag the end-of-project marker to the left or right.
During playback, a project stops when it reaches the end-of-project marker. When recording, the end-of-project marker moves to accommodate the end of the recording (if recording extends past the current position of the marker).