How can I sort my 'Sell Online' items for easier access?

Starting with Flint 4.0, you can sort your 'Sell Online' items from within the Flint app.

Go to 'Items' on the bottom -> Edit -> Reorder your items with the control on the right side -> Done

Your new order will also be reflected within the Flint Merchant Portal: http://account.flint.com/mp/items