Editorial and effects work on a stereo track is automatically synchronized between the left eye and the right eye layers. Any changes applied to one layer of a stereo track are automatically applied to the other layer.
You can remove this stereo sync between layers if you are changing the media of a clip. However, the metadata must always be identical between the left eye and right eye layers. The layers must share the same resolution, bit depth, and framerate. As well, they must be of the same duration and have the same number of edits (for example, transitions and cuts) in the same places. This means that editing operations such as trimming and sliding can only be done on both layers simultaneously.
(a) Stereo Sync icon (b) Stereo track identifiers (c) Layer names