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When you lock layers, it ensures that nothing is accidentally altered. Locking a layer can also be used to indicate completion. When changes need to be made to a locked layer, unlock it and rework things. When finished, you can lock it again. When saving as a TIFF or PSD, your locked layers will be saved.

In each layer, there is a lock. Tapping it will lock and unlock SOMETHING; however, pay special attention to the body of the lock to know what you’ve locked or unlocked.

If the body of the lock is checked
, it is locking layer transparency.
If the body of the lock is a solid color
, it is locking the layer.
If the body of the lock is half solid and half checked
, it is locking both the layer and its transparency.
Pay attention to any warning that appear. They will explain what is locked and needs to be unlocked to do certain actions.

.
.For tablet and handheld device users, to lock a layer, tap a selected layer or double-tap an unselected layer to open the Layer Menu. Tap Lock Layer. Do the same to unlock it.


To lock a layer, in the Layer Editor, select the layer.
In the select a layer, tap-hold
, then swipe and select
.