I accidentally deleted a pattern from one of my libraries in creative cloud. I briefly saw a transparent popup that included an undo button. This vanished as I was moving to click it. CMD+Z (I'm on mac) did nothing, and I see no menu option for undoing anything. There is surely a way to undo what i just did other than the now-vanished popup. Please tell me where i can find it. The attached screenshot is the view I had into the library when this happened. I would like to sarcastically thank Adobe for hiding this feature, and for allowing one-click deletion without a confirmation click.