The feature was only introduced in May, but the latest Insider build lets you disable the AI Actions section entirely, instead of leaving it empty.
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Microsoft’s AI obsession is scaring me

Too much AI is taking away the soul of Windows.
If you encounter Event ID 6273, "Network policy server denied access to a user," in the Event Viewer, follow the solutions ...
With both features disabled, Gemini will not be able to generate text for you on the fly or make it easier to find old tabs.