Is there a way to lock the Monarch keyboard?

My student rests his arms when he is reading braille, and I’m noticing he is accidentally hitting the Monarch keyboard when he is reading braille on its screen. Is there a way to lock the keyboard while reading? Thanks!

I have this problem with my students, especially the little guys. I found you have to toggle between read only and edit mode. When in read only it won’t do anything when the keys are touched.