When closing a design, you are presented with two options, Save and Cancel. Save works as expected, but Cancel breaks UI/UX designs because it is not a 'Cancel' operation, but rather a 'Discard' operation. There actually is no way to cancel in case you accidentally initiated a close operation allowing you to simply remain in your work.
As such, it should be changed to 'Save, Discard and Cancel' with 'Discard' working the way the current 'Cancel' button does, and 'Cancel' allowing you to just go back to the design, dismissing or 'canceling' the close operation as if it hadn't been performed.
Anything else is not following tried and true standards and is very confusing, and potentially disasterous to the end user, thinking they're simply canceling the save operation, but instead losing all their work.