DuckDuckGo Search simply guesses your location using a GEO::IP lookup with the IP address that's automatically sent to us via your device; then we throw away the IP address. [...] The next time you perform a local search, selecting “Use Location” will send us a random location nearby, while hiding your actual location from DuckDuckGo. [...] If you’d rather choose a custom location instead, you can pick “Set Location on Map” instead of “Use Location.” This bypasses the browser location permission, but still keeps your precise location anonymous to us.

I've just switched back to Brave, because (No AI) DDG keeps localizing results, despite region filter set to "All regions"; which really bugs me. If you want to disable Brave's annoying AI "feature" (the reason I switched to DDG), without having to store a cookie: install the Redirector addon and 'Create new redirect' with:

Example URL: https://search.brave.com/search?q=test

Include pattern: https://search.brave.com/search?q=*

Redirect to: https://search.brave.com/search?q=$1&summary=0

Edit: Lemmy reformatting contents of the code block