Artboard is a great way to manage and create a group of images/designs with all of them laying out on the table while individually editted.
My suggestion is to add the ability to flip individual artboard at a time, without flipping the whole canvas.
Because sometimes while I am sketching on one of the artboards, I need to flip the sketch constantly to check perspective/symmetry, etc. If flipping the whole canvas is the only option, I noticed that it can take minutes sometimes to complete the calculation, ending up stucking my workflow.