highlight the search terms in the document, just like CTRL+F in Chrome

yes, that what I call "Advanced search"

that feature is game changer!

also remember last results when open Ctrl + Shift + F

This is such a need indeed.

Agree with you. The ability to search all pdf files within a floder is more attracted.

Yes, with the ability to copy-paste result

Also, please watch request :

"Jump to previous/next location (navigation history)"