@grace45 Hello!!
Yes, some websites are restricted by Opera, despite the fact that they pose no threat to browser security. This problem occurred on one of my friend's website, although in a different way. We've discovered a solution, and all of the websites are now functional.
I'm not sure if you're getting the same warning on your screen or not. I'll need a screenshot or the URL to that page so that I can provide you with an accurate solution trick.