Really sorry about that. It is an experimental feature called "Power Search" in the settings page. Like every feature, it is optional and an oversight from my end left it enabled by default for new users.

I have released an emergency fix version 9.0.5 and it is live now. Please update to the latest version and accept my apologies for the confusion. I'm just a solo dev and despite the most rigorous testing from my end, sometimes things slip through 🙏