The Property Search form builder for Elementor was added in the 3.5 theme version. The widget can be easily used to create new and attractive search forms.
Before reading this help file you may want to check this video. It explains theme functionality and may be easier to understand. Watch Video on Youtube
The widget can be found under WP Rentals Widgets and can be added in the page with Drag and Drop
The widget will have the option to add search fields to set the search button.
and also to set your settings for the form and the button