Codes for Anime Eternal mostly yield Potion Bundles, or at least that's what I've seen so far. That may leave you longing for more direct drops for things like tokens or extra accessories, but a ...

The easiest way to do it is to right-click the app's icon on the Dock, then click the "Quit" button. The Santa hat should be gone now. If it isn't, check whether the "Allow automatic icon changes" ...