search only on category not all

-- url of the page with the problem -- : www.dailybread.co.uk
-- HikaShop version -- : 4.2.1
-- Joomla version -- : 3.9.10
-- PHP version -- : 7.1.30
-- Browser(s) name and version -- : chrome

Hi
On the home page I put in a search term and I get the result I require.

However if I click on a menu to a product category and search for a product it only searches within that category.

The search needs to check the whole product list.

Example go to flour, add to cart what I need from there then search on another product, because that product may not be under flour it just shows product not found. Have to go back to home page and search from there.