Lock or unlock masks

Locking a mask prevents you from selecting it in the Timeline, Composition, and Layer panels or setting it as a target in the Layer panel. Use this feature to avoid unwanted changes to the mask.

In the Timeline panel, expand the Masks property group.
In the A/V Features column, click the box underneath the Lock icon next to the mask you want to lock or unlock. A mask is locked and cannot be selected when its Lock switch is selected—that is, when the Lock icon appears in the box.

Note: To unlock multiple masks at one time, select one or more layers and choose Layer > Mask > Unlock All Masks.