An update for Circle to Search in the latest beta of the Google app is changing the behavior to automatically capture the whole screen and add it to your query.
With the update, if you want to perform a general text search, you will need to remove the image from the search.
Circle to Search (CtS), the AI-powered search tool, now shows a pill-shaped search bar at the bottom of the screen when activated.
Currently, tapping on the search bar opens up a page of suggestions with a field to enter a text query for searching.