The widget works the same as Advanced Search in Google Maps (has the same fields). For search type 3, 4 and 5 the widget can include the custom fields saved from theme options. Help – https://help.wprentals.org/article/advanced-search-type-3-and-4-custom-search-fields-setup/
Drag and drop the widget to any sidebar. Help https://help.wprentals.org/article/sidebars/
The widget will display on sidebar.