You can lock any element on the board to prevent accidental edits.
How to lock objects
Lock an object by clicking on it and selecting the lock option in the floating menu bar that appears above. You can unlock by clicking the padlock again:
There is also a lock option available when using the right mouse button.
Use the lock option in the menu
This is a really useful command, which will lock all layout objects: text, zones, shapes and images. Right-click anywhere on the board background to see this option:
Using Lock Layout saves a lot of time!
Tip - To select multiple locked objects at the same time hold down the Shift and Alt keys, then click and drag to create a selection net around the objects. You can then move, re-size or rotate these objects. You can select both locked and non-locked objects together this way.