Locking Object Positions
The menu Lock > Position will lock the position and size of all selected objects. Locked objects cannot be accidentally moved or resized.
You can see that an object is locked by the small lock icon in the lower-right corner. While locked objects cannot be selected in the edit area, you can still select it and perform changes to the object in the timeline. To unlock an object, select it in the timeline and click the menu Lock > Position again.