as you can see there is no additional option for search with custom custom post type, but you can tweak the code if you want to add your custom post type appear in search result.
There is 2 result page for search, search.php (native search) & searchresult.php (ajax search).
If you open both search.php & searchresult.php, you’ll found ‘post_type’ word.
Replace the ‘$val_post’ with :
Save your files.
Let me know if it doesn’t help.