Go to Appearance settings and Select what style you wish to have for your property unit as default style: list or grid

This option applies for all properties lists: properties list custom page (standard and half map), taxonomy page list, advanced search results list.

List style example: http://demo1.wpresidence.net/

TECHNICAL: How to make list only for Similar Listings in Property Page

Go to:

wpresidence/templates/similar_listings.php

Add: 
$wpestate_prop_unit = 'list';

Comment: 
//$wpestate_prop_unit          =   esc_html ( wpresidence_get_option('wp_estate_prop_unit','') );