How are items ordered in the search results when using the Procurement catalogs

We would like to understand how the search results are ordered when searching for items within our catalogs.

For example, when searching for 'Water' we get the following results:

This search doesn't seem to follow any clear order or logic of how and why these items are in this particular order.

We would like to understand what is the default order in which items are displayed? Specifically, what factors or criteria determine the sequence of the search results?

Also, is there any way to configure the order or logic of search results?

Thanks,

Francisco