Generally, when Google wants to take you into AI Mode from an AI Overview, it uses a button that says see more or some variation of that. But now Google is testing "Enter AI Mode" as the call to action.
This test was spotted by Radu Oncescu who posted about it on X - here is his screenshot:
Honestly, I like this better, because it is more descriptive of what you should expect. "See more" might just show you more search results, which we know isn't true. But "Enter AI Mode" is exactly what the button does.
Forum discussion at X.
