I have a custom search for IMDB using "i", so when I need to search for something that starts with "i", I just add a "g" before to manually indicate I want to use Google. For example, "g i want to break free". So in your case, just typing "g b and m" should do the trick.
I think in the past we were able to change these shortcuts or even delete them, but now I see they are static. 😞
@888larson I somehow got it working on Reddit but unfortunately, it doesn't work on youtube. For search results, you need to allow it "Allow access to search page results" from addon settings. I feel opera should by themselves allow us to increase youtube and Reddit scrolling bar outlook when there's no working addon in the opera store. I am using opera gx due to features that are missing in opera normal.