Sure!
Go to the backend of that page and you will find “Hooks on standard WP functions” with select boxes for title, content and excerpt. Choose “disable” for all three and this page will not be editable.
If most pages should be disabled, you can also take the reverse approach. In the plugin options, disable editing for these 3 items, then go to the pages that you DO want to be editable. Set the selectboxes to “enable”.
By default the selectboxes have the value “use default settings”, which means they follow the global settings.
You can define your settings individually for title, content and excerpt.
Good luck, Carlo