Unable to change default search engine/Omnibox search engine

Description of the issue:
How can this issue be reproduced?

  1. Typing a search term into the Omnibox
  2. Attempting to change the default search engine using Settings ----> Search Engine
  3. Attempting to change the default search engine using Settings ----> Manage search engines and site search —> clicking on three dots next to Brave search engine

Expected result:
A webpage from Brave Search shows with the typed term
Brave Version( check About Brave):
1.75.181
Additional Information:
When I click “Change” under Normal Window in settings, nothing happens. When I try to change the default search engine in “Manage search engines and site search”, “Make default is greyed out.” The URL bar/Omnibox only shows a magnifying glass when attempting to search. When you hit enter after typing a search term, nothing happens.
Screenshot 2025-03-02 204133