Lock Object

Selecting Object > Lock Object locks the currently selected element (body part, prop, etc.). To lock your desired actor, select it, then select Object > Lock Object. The currently selected actor will be locked, meaning that it will not move relative to its parent. For example, if the elbow is bent 45 degrees relative to the upper arm, it will hold that position. Locking actors is a great way to protect your work once you’ve perfected a portion of your figure.

To unlock a locked actor, select it and Object > Lock Object. A checkbox appears next to this menu item when the selected actor is locked, and reselecting this option clears the checkbox and unlocks the actor.