To change the default search engine, go to Chrome's Settings menu and click the Search Engine section, then choose a different search engine. On the desktop, you may also need to disable or delete any Bing browser extensions.

Click the three dots in the upper right-hand corner, then click “Settings”. In the left-hand navigation, click “Search engines”. Swap “Bing” for any other search engine you’d like to use. You should also check “On startup,” which is also in the left-hand navigation. If the Bing homepage is there, click the three-dot menu there, then Remove.