To display results from a different search engine,
- Navigate to your preferred search engine’s web site.
- Click or tap the Three Horizon Dots" icon (the one with the three dots) in the upper-right corner, and then choose Settings.
- Under the Settings menu, scroll down to the Privacy, Search, and Services section, then click or tap the Look for the Search and connected experience section. Then click on Address bar and search.
- Scroll down to the Search engine used in the address bar with pulldown menu, click or tap the down arrow to the right of Bing, and then choose what search engine to use.
Source: https://techhelpkb.com/how-to-change-the-default-search-engine-in-microsoft-edge/