Privacy Policy check box in comments form

I have latest version of Catch Box free theme and latest version of Wordpress. However, check box is not showing for privacy policy. Apparently, it should be there as a default in Wordpress and so Catch is over-riding it. In another support topic, I see that the theme should allow me to customise comments. It doesn't. Also, I have seen reference to unchecking the box 'Users must be registered and logged in to comment' in the discussion area of Wordpress settings. I need this check box for GDPR compliance purposes. I have installed the Cookie Compliance plugin in the hope that that would fix it. It hasn't. Please help me get this checkbox back to the Wordpress default.