Once a variant of the product is added while creating the product, it will start appearing on the variant listing page.
A variant state is active, once it's created. On the listing page, one can view the basic information of variants, like the name of the product to which it belongs, available stock count, reserved count, quantity on hand count, and inbound count. Moreover, one can view the in-stock and out-of-stock variants from the listing page by toggling in stock button On and Off.
One can also create, import or export products from variant listing page.