Toggle Comments

I need help, I am busy building a site for a family member, and I need t toggle comments OFF for the WHOLE site. I have been able to toggle them off for articles / blog posts, but still on the main pages (Home, Contact us, Courses, etc) it still shows. WHERE is the toggle button, I have tried plugins, but this is getting irritating now as it is not in the usual place that EVERY tutorial / help page I find says it is.

In the previous versions I was able to, now I don’t even get the option.