From Retailers > Connected in your Collective: Supplier sales channel, select the retailer, click Delete retailer, optionally report misconduct with a message,...

If automatic payments were on with that retailer, you'll continue to be paid automatically for orders already fulfilled, though any new orders you choose to shi...

If you want to stop selling through Collective altogether, go to Sales channels > Collective: Supplier, open the menu, choose Uninstall, select a reason, option...