How do you display the stock input/output account in a product?

I've turned on the "Manage Inventory Valuation and Costing Methods" setting on my user.

I've turned on the " Generate accounting entries per stock movement" setting from the Settings > Warehouse > Accounting > Accounting.

But the stock input/output accounts still don't show in my product's Accounting tab.

What else do I need to do?

Many thanks in advance.