By default you have two skin options “Standard” and “Custom template“. (It does not work with the default Elementor skins that comes with the Elementor plugin due to how items are rendered.) The custom template enables a dropdown with detected Elementor templates to choose from. Choose the one that you want to use to render a single item. See “Create a single item template” for instructions.
With “No posts found” as with the Skin option you can select a Standard or a Custom Template.