Different web browsers have different methods for removing Bing as the default search engine.
Here's how to proceed on Chrome.
Go to Google Chrome and navigate to the "Options" represented by three vertical lines.
Tap on "Settings" and under "Appearance", delete the Bing web address.
In the new tab, go under the search engine section and click on the drop-down menu. Choose the search engine you intend to use other than Bing.
After that, click "Manage Search Engine." Then, on the right, click "More Actions" to remove Bing from the list.
Return to Settings and navigate to the "On Startup" section. If you find Bing under "Open a specific page or set of pages," remove it.
When you exit the Settings page, your changes will be saved.