You can't switch them off: Google says AI Overviews are a core Search feature and that features cannot be turned off. What works is the Web filter: after you search, tap Web under the search box and Google shows only text links, with no AI Overview. To make that your default, add a site search in Chrome's search engine settings using Google's search address with udm=14 at the end, the code behind the Web filter, and set it as default. Turning off 'AI in Search' in Search Labs only stops the experiments, not AI Overviews. In India they appear in English, Hindi, Kannada and other languages, so the same steps apply. When you do read one, open its links, since Google itself says AI Overviews can and will make mistakes.
Google's own page: AI Overviews are a core feature that cannot be turned off, the Web filter shows only text links, AI in Search in Labs can be turned off, and the countries and languages (including Hindi and Kannada) where they appear.
A free page that runs your search straight into Google's Web view with no AI Overview, from the people who documented udm=14; the code is open under CC0.