@operauser12356 Exactly the same thing here. Yesterday it was random, today I noticed it's permanently on the old design. This quick fix I found in google forums or maybe the permanent fix - I get sick to the stomach from the old design. I've added this to my Opera properties i.e. right click Opera icon, choose Properties.

"C:\Program Files\Opera\launcher.exe" --user-agent="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

The problem is that Google isn't recognizing Opera as the Opera browser, sees it as something else or an unknown browser.