Hi Gökhan, I am John J.D., a fellow Microsoft user like you.
I understand you're looking for ways to change the default search engine in your browser. I'm here to help.
Are you referring to Microsoft Edge in Windows?
In Edge, you can do this by following these steps:
> Open Microsoft Edge and press Alt + F keys, then click on "Settings."
> Click "Privacy, search, and services."
> Scroll down and look for the "Services" section.
> Under this, click "Address bar and search."
> In "Search engine used in the address bar," click the selection next to it to expand and choose the search engine you prefer.
If this wasn't the case, please provide as much detail as possible, and current Windows version and build you are using.
John J.D.