Thanks, I’ve used those customs files in a child theme and the search worked great!
ps: in the content-slideshow.php what I did was just remove the dropdown menu lines, as following:
<option value="post"><?php _e('Blog Posts','Samsara');?></option>
<option value="portfolio"><?php _e('Portfolios','Samsara');?></option>
<?php if(is_plugin_active('woocommerce/woocommerce.php')):?>
<option value="product"><?php _e('Products','Samsara');?></option>