This screen shows you option to manage your coin's inventory. What is coin inventory?

Evey crypto currency wallet is very much like your regular phisical wallet. Just like in your physical wallet if you have different currency notes and coins available, that means they are not spent. You can spend them. If you use the same analogy in crypto currency, these unspent notes and coins can be referred as unspent transactions. In tiny bit technical term it's called Unspent Transaction Output, in short UTXO

The decentralised Exchange doesn't run on total balance of your crypto currency wallet. It needs small unspent transctions. So, if you have sent a big transction to your BarterDEX smart address, you can use this screen to split your balance to number of small UTXOs.

By clicking Make Inventory button it will split your smart address balance to number of UTXOs and send them back to your smart address. It will cost regular transaction fee to split your smart address balance.