Once layers have been synced, they can just as easily be unsynced.
How to unsync layers
- In the Timeline view, right-click on the child layer of a synced pairing.
- From the right-click menu, select Unsync Layer.
The parent layer is unsynced and the link icons disappears.
NOTE: If this menu item is disabled, then the selected layer is either the parent layer or a layer that is already unsynced.