Cancel/Disconnect buttons don't stop file/folder transfer

[Dave H]

I accidentally dragged over the wrong folder to transfer to my computer (huge number of files and folders in it), and I clicked the Cancel button (red flag with X in it) but it did nothing, then I clicked the Disconnect button (mouse with X over it), and the files kept transferring. I had to close FileZilla to get it to stop (which thankfully stopped the process).

Are these buttons not actually supposed to cancel a transfer or disconnect from the server? If I'm not using it contextually correctly, what exactly is the "current" server it refers to if they're highlighted? I was actually only connected to one server at the time.