One can right-click to add slides in Presentations, but Copy does not work. So the feature should be deleted, because selecting it returns a message that says the feature does not work, so it is misleading to have it there as users would expect a feature to work. If it works on other browsers than Edge, than Aha! presentations should be branded as Safari-only/Chrome-only, or whichever the browser what that feature might be available.
Thank you for your idea. It is possible to copy/paste using keyboard shortcuts. We have considered removing these options from the right click menu, however we have opted to keep them their to help educate new users that using keyboard shortcuts is possible.