See example sites that using Search & Filter Pro plugin

Go to install this plugin here and then activate this plugin on your site
Go setting at widget
Add new search form and then go to setup

General: you can use whatever post type that you want to search
Display Results: Choose result method

Ajax: you can mention the id/class of the container to run ajax

Other tabs, Normally we use the default setting from plugin, just for some case that has a spacial requirement
Advanced tabs, Relevanssi: discus with P'boom || example: https://www.