you can't change background there. And it's not recommended to use list module if you have no content in products. Use grid layouts instead

Also where is it possible to change background color for products on archive page. Maybe you can add some css but dunno where

1. Theme options - general and select layout for archives

2. Sorry, we provide help and guarantee only for woocommerce regular filters. If you use any custom plugin, please, write to author of plugin

Three questions:

1. Is it possible to edit Rehub custom archive design. Or do you have to develop a new template from elementor.

2. I am using Yith filter plugin. For customized product archive pages with woocommerce shop sidebar added i am not able to see the filter button on mobile. in the plugin i have  activated: Show as modal on mobile and it works perfectly fine when browsing non customized archive pages. I have made it work once, maybe you know why it is not showing. 

3. Product pages without variations: Looks weird. See attached screenshot.