1. Select the object
2. Open the Menu.
Figure 1: Select Object.
3. Choose the Padlock icon in the bottom right of the Menu options.
Figure 2: Lock Object to Background.
✏️Note: When the object is locked it cannot be moved or edited.
To unlock the object:
1. Select the object with either Lasso Tool or the Harpoon Tool.
2.Click the Padlock to unlock it from the background.
Figure 3: Unlocking an Object From the Background.
✏️Note: You can select a group of objects with any of the Selection Tools and lock all those items to the background at the same time, but you must unlock them one-by-one.