New design config allows you to configure whether product filters should be displayed as a horizontal widget above the product list (new setting) or in the sidebar (as it worked previously).
Changes in API
New product_filters_orientation design config (string type) allows you to change the product filters orientation on the storefront:
HORIZONTAL enables a new design where filters are displayed above the product list.
VERTICAL (default) enables product filters in the sidebar. This value is also applied if the product_filters_orientation config is omitted.
This setting can be enabled as a store config (through the PUT/profile call) or as a design config setting on the storefront by adding JS/HTML code to your website.