Hello, Shehzad Ghazi,
Thank you for the reply.
We understand that this situation is caused by custom changes that were made, as we can see, a lot of files have been re-written via the child theme. Unfortunately, we are not responsible for custom changes made by customers. We would recommend that you contact the person who made the changes and ask for assistance.
In Theme Options > Header Builder > Account > Content Type > Off-Canvas is activated – https://prnt.sc/JwRIvdthwqxP , so it should work in the same way as it does on the demo when you activate the parent theme, without any custom code in the child theme.
Parent theme does not inherit child theme options. So, once you switch from child to parent you get other settings. If you want to import child setting to parent you need to go to Theme Options > Import/Export > export child theme settings, then switch to parent theme and import settings.
We hope this helps and your developer will be able to revert his changes to help you.
Kind Regards,
8theme team