For configurating VMF press the 'Parameters' button placed at the top of the 'Values' page.

This button is visible only to Super Administrators

The main parameters here are:

Products per row. Defines the products of each row of the results page.

Matching of selected values. This is a very important parameter as it defines the filtering type you would like to have.
The Relative means that the results will contain every product that match at least one of the selected criteria.

In this case you can use the Best Match sorting option to display higher the products that match to more selected criteria.

The Absolute means that the results will contain only products that match to all the selected criteria.