Hi @kklo,
Once the vendor uploads a product from their vendor dashboard. The admin needs to approve those products to be published on the site. To do that, as an admin you will need to navigate to your WordPress admin panel’s Products > All Products section. Then choose the products you want to publish and use the bulk edit feature to edit them like shown in this screenshot.
Then change the product status to Published as shown in this screenshot. Update the setings and this will make the selected products publised as we can see in this screenshot.
I hope this information will help. Cheers!