Out of the box, Windows 10 allows you to search the web right from the taskbar. However, the search engine is set to Bing, and there is no option to change it like you can in the Edge browser.
This is surely to irk many Windows users, but luckily, the folks over at Mozilla decided to ease our pain by creating a way to set Google as the default search engine for the Windows 10 taskbar, albeit with a little trickery.
Source:
How to Set Google as the Default Search Engine for the Taskbar in Windows 10 « Windows Tips