Change in Page Edit Screen

I am hoping you can help me with a sudden change that has occurred to my edit (and create) page screens. Specifically, when I try to edit a page now, the content to be edited is now presented in a relatively narrow column in the middle of the page, and many of the editing controls — such as for switching back and forth between classic WP editing and WPBakery editing — are no longer presented. I don’t believe I changed any configurations. I know this may be a stupid question and that it may not be Highend theme functionality that has changed, but I’d very much appreciate any insights/help you can give me. So that you can visualize what I’m talking about, I’ve attached a screenshot. Please let me know if you need more info.

Thank you very much in advance!

Paul