Q: Preview highlight Sierra

If you mean this…

Yes.

I'm afraid not. I suspect it's in the coding of Preview.

You could send Apple feedback…

http://www.apple.com/feedback/

under Sierra.

Adobe Acrobat Reader DC also now defaults to this ugly orange highlight, but unlike Preview, you can right-click on your highlighted selection, select properties from the menu, and change the color to vivid, consistent yellow, or any other color from the Apple color picker.