I Closed the Plugin While Waiting for a Transaction to Be Completed, How Do I Know Once It’s Done?

You can see all your transactions from the Viewblock block explorer, which can be accessed via the hamburger icon. You will find your wallet address below your username. Next to it, you will see 2 icons, one for copying your address and another one that will send you to Viewblock, from which you will be able to see the set of trades you have made. See the example below


The red arrow indicates the failed transactions, so you see the failure icon.

the green arrow indicates the transaction that was successful.