Search restricted per category

Hello,

We have 2 pages using this plugin...

https://www.informationsheets.co.uk/dunnes-stores/

https://www.informationsheets.co.uk/cleanline/

We need the search to only find documents on that page.

For example, if you go to - https://www.informationsheets.co.uk/dunnes-stores/ - and search for "BCS" which is not actually a document on this page, it pulls results which are actually assigned to the "cleanline" categoy/page..

How can we make the search only pull results from the page/category selected?