Hello, @Lodrigo.
1. Please make sure that you have disabled the Yith WooCommerce Ajax Search plugin on your site, because you can not use both at the same time on the same site, for using the theme live search feature, you have to deactivate the plugin and vice versa.
2. Actually that “Post Type Simple” is created using the “Post Type” under Porto >> Templates Builder and you can only create using the Gutenberg page builder, that is the reason the Elementor or WP Bakery editing will not work on it.
So you have to simply edit that Post Type https://postimg.cc/Mn2Vh7jH and then you can change the color by editing that button
from style options: https://postimg.cc/rKPMmj9y
Regards, P-THEMES.