Manage timelines
The timelines are in the bottom panel:
Click or click-and-drag on the time ruler to change the time cursor position.
Click on a clip or on a timeline to select it.
Click-and-drag on a clip to move it (change its starting time).
Click on the 
button to add a timeline.
Click on the 
button of a timeline to activate/deactivate it (processed or not).
