To create a Mini Shop add a new Page and choose Builder Shop as page Template.

As you choose the template, the builder will be filled with all the products that you have already created. Move them, change their dimension, edit the presentation content, just like another RexClassic archive.

Every product block content will automatically filled with some shortcodes, to display product data.
Check out the list of available shortcodes at this link:

Shop Shortcodes