Q: Search Genius hijacked Chrome

Download and run Malwarebytes Anti-Malware: http://www.adwaremedic.com/index.php 

You can also remove the adware manually using the steps provided by Apple: https://support.apple.com/en-us/HT203987

After that, make sure your default search engine is set to the one you always use. To do so, Open Safari - Preferences - Search.

Go to Safari menu (At the very top right side of your screen next to Apple icon), choose "Quit Safari"

press "Shift" button and while holding this button on your keyboard single click on the Safari icon on your Dock.

Open Safari - Preferences - Privacy - Remove All Website Data.

Also, I believe it would be a good idea to install AdBlock.

Have you tried resetting Chrome?

https://support.google.com/chrome/answer/3296214?hl=en

try this…https://support.google.com/chrome/answer/142059?hl=en

You're welcome.