You might edit many tracks at the same time, and if you don't want to mess up one track, you can lock the whole track by clicking the lock icon on the left of the track. So how do we unlock a video track if you want to continue to edit this track?
Step 1. Open a video project;
Step 2. Locking/Unlocking a video track both by clicking the lock icon on the left of the curtain track.
Step 3. After unlocking the track, you can continue to edit the clips on this track.
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