If you have ticked to show AVAILABLE TO SELL FUTURE on the Buyer portal - your Buyer's will be able to view the dates which goods will be available from. This data is pulled from the production order product 'Delivery From' date.
The 'Available Future' value is pulling from your PROJECTED STOCK levels.
If you cannot see this option please update your Digital Showroom system settings.
For support with previewing the portal, or sending the portal link.