Hiding Admin Pages and Files from Google

Hi Support
I haven’t seen this issue before.

Google Analytics is saying that this page is not Mobile Friendly – https://easyonlinebizsolutions.com/webinars/go-pro-tools-pm/

How do we hide pages and files like this so that Google doesn’t get confused crawling them. Surely it’s not good for SEO.

Any ideas would be appreciated.

Kind regards

Dave Cane