How to lock the views to prevent accidental alterations

I have just moved over to a Wetek Play 2 from a Mede8er 600 and I am learning my way around.

Is there away to lock the program so that only the favourites show, and if so, how would you get back to the normal screen.

Also, can you lock the program so that there can be no changes made accidently and again how to get back to normal