Your screenshot helped me to provide you solution. You can not assign duplicate product from here. Fro backend you can assign one product to one seller. Only seller can upload duplicate from his dashboard.
Hello how are you …
Even with import and export of Dokan, has not solved the problem.
I can work only making a new version of each product for each new salesperson what is feasible.
Unfortunately the Dokan does not meet my expectations and I chose to exchange it for another plugin.
This is a function that the Dokan should have when registered a new seller after the approval of registration, be released a new store with all the products, and not the seller have to register product by product.
I appreciate greatly the support and attention given to me.