You can change your default search engine from Bing to Google in Edge browser by following these steps.
Step 1. Go to Edge Settings
Click on three dots (...) in Edge menu next to your profile and select Settings from the menu.
Step 2. Select Privacy, search, and services
Click on Privacy, search, and services menu in the left side bar,
Step 3. At the bottom of the Services, you will see Address bar and search box.
Click on Address bar and search option to expand it.
Step 4. Select Google search engine
On Search engine used in the address bar option, click on the dropdown and select Google from the list.
Step 5. Close settings and you are all done.