When I search for a subject, bing hijacks my search.

You have adware/malware installed. Use  Malwarebytes Anti-Malware for Mac. It may be necessary to run more than one scan. After scanning a couple of times, restart the computer and test. If necessary, follow the manual instructions.  Do not download any other programs that are listed in the articles.   Malwarebytes uninstall

 https://www.2-spyware.com/remove-bing-redirect-virus.html

 How to get rid of Bing.com Redirect - Virus removal guide

You are welcome. If you do a lot of Internet searches on some questionable sites, then the premium version is worthwhile. If your searches are limited, you can just download it again if needed.

You are welcome. You can always upgrade later if you need to.