Hi Mateusz,
I am sorry you had to face this, but in the admin general settings, it is very clearly mentioned that the button text change will work on the archive pages (shop, product category page, product tag page) provided by the WooCommerce plugin.
If you’re referring to the search page that is generated by the plugin, the button text functionality is not effective there. We’ll add this in the next release.
Secondly, the banners do work. For now, you’ll have to provide media file ID in the page settings. We’re making those settings more advanced in our next release, so you’ll find better experiences.
If you continue to face similar issues, you can connect us through our contact page: https://www.cmsminds.com/contact/
Thanks,
cmsMinds.