What exists now – fills in the entire content based on your number of properties.
You listed 2 properties in shortcode adn the shortcode aligns 2 properties in the full width container.
Specify 4 properties and than the container will be divided into 4 columns, making room for 4 properties.
The design automatically changes based on the number of properties selected.
Hope it helps explain.
You have the right design for e 2 properties typed in the shortcode.
If you wish images with smaller width you need to change the number of properties in the shortcode, as I explained above.
It may work without you having to do more than that. Just try and let me know.