Lock objects

You would certainly like to avoid inadvertently moving, modifying, or deleting an object, so you might want to lock it.

How to proceed

1. Select one or more objects.
2. Lock it/them with the button "Lock" or ⌘ + L.
3. If you would like to unlock 1 locked item, select it with ALT + CLICK and unlock it or Unlock all objects locked at anytime with the button "Unlock" or ⇧ + ⌘ + L

Video step by step

Check this video to know how to proceed