Bing as default search engine in ProPlus update in Feb 2020
Beginning with Version 2002 of Office 365 ProPlus, Microsoft will install a browser extension that makes Bing the default search engine for Google Chrome.
You can disable the extension by:
Clicking the search icon (magnifying glass) to the right of the URL bar;
Then toggling off Use Bing as your default search engine; and
Restarting the browser.