I found it, but couldn't make it work. Pixel 3a running Android 10 and the stock Chrome browser. Hitting enter on the search field did nothing and I can't see any other submit button. Then again, 10% of the search field is also missing.
On second look, it's real-time. No need to submit. The results just blend into the page so I thought it was broken.
Sorry to hear that. Not an expert, but if you have any ideas on how to improve the UX I'd be thankful.
It is at the top right in a search icon. Right underneath his about me link.