Stifling a decent rant! Edge has made it near impossible to change Search Engine!

To use Google as the default search engine in Microsoft Edge on Windows 10, use the built‑in search engine settings rather than manually entering the three custom fields.

1. In Edge, first perform a search using Google:
   • Go to https://www.google.com.
   • Type anything in the Google search box and run the search.
   • This lets Edge detect Google as a search provider via OpenSearch.
2. Open Edge settings:
   • Select Settings and more (the ... menu in the top-right) > Settings.
3. Go to the address bar search settings:
   • Select Privacy, search, and services.
   • Select Search and connected services, then Address bar and search.
4. Change the default search engine:
   • In Search engine used in the address bar, open the dropdown.
   • Choose Google from the list.

If Google still does not appear in the list after doing a search from google.com, the local search provider list may be corrupted. In that case, reset Edge’s search data so it rebuilds the list:

1. Close all Edge windows.
2. Open Command Prompt as administrator.
3. Run the moderator-recommended script that terminates msedge processes, waits a few seconds, and deletes the Web Data file (this is the file Edge uses to store search providers). When Edge is started again, it regenerates Web Data and reloads the available search engines, after which Google should appear as an option in Search engine used in the address bar.

After that, repeat steps 2–4 above to select Google.

Note: On managed or MDM-enrolled devices, an administrator policy such as AllowSearchEngineCustomization set to disallow changes can prevent changing the default search engine. In that case, the setting will be locked and must be changed by the administrator.

References:

• Change your default search engine in Microsoft Edge
• User data and privacy in Microsoft Edge
• Policy CSP - Browser
• How can i change edge search engine from bing to google? - Microsoft Q&A question above!