I don't see the option to enable any Google labs search experiments, but just to test if it helps, goto the URL opera://settings/content/all, type google.com in the search field and click "delete displayed content". Then, close Opera.
Then, open up a command prompt and start Opera like this:
"C:\Users\yourusername\AppData\Local\Programs\Opera\opera.exe" "--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36"
(Adjust the path to your opera.exe.)
Then, once Opera starts, goto the URL opera://browserjs and disable browser.js for the session.
Then, sign into Google and try things.
Vivaldi for example already does that to pretend to be Chrome. Might help with Opera too.