How to Lock and Unlock Pages
If you are finished with styling and editing a certain page of your ebook and you don't want it to be accidentally changed, you would need to lock it.
Locking a page is disabling any changes on that particular page.
If you want to lock a page, you would need to click on the lock icon on the top right section above the page.
Now you wouldn't be able to make any changes. Also, you wouldn't be able to make global changes within the book unless all pages are unlocked.
On the right side in the navigation panel, the locked pages would be shaded, that is how you can understand which pages are locked and which are not.
That is how to lock and unlock pages with Designrr.