Lock & unlock objects

Locked objects will not be selected by Lasso, unless you've enabled Select locked objects in lasso tool. In eraser settings, you can also toggle Erase locked objects to allow/disallow erasing locked objects

To lock objects:

1. Select Lasso tool. Use lasso tool to select the objects that are to be locked.
2. Tap the lock button.

To unlock objects:

1. Select Lasso tool. Tap the Lasso tool button again to open lasso settings.
2. Enable Select locked objects. Close lasso settings.
3. Use lasso to select the objects that are to be unlocked. Tap the unlock button.