If the search text field is disabled and you cannot type anything, it typically means no search plugins are installed or the search engine hasn't been enabled. Click "Search plugins..." and ensure you have at least one plugin listed. Also, verify that "Search engine" is checked under the "View" menu.
Go back to GitHub, check for an updated version of the .py script, and overwrite your old plugin. 2. Domain Blocking and Proxies 1337x qbittorrent search plugin