So, this may have been covered, but after a brief and completely amatuerish search attempt, I didn't find anything relevant. I have made a video that documents how to copy the UI from one character to another, akin to what the /copylayout command would do, were it available to us. I made this video because I have talked a number of people through the process in recent weeks, and it would seem that enough people are unaware of how to do this and would benefit greatly from the knowledge. If there are easier or more well known methods, then I would love to hear them, but if not, then please enjoy this video tutorial on making your life a million times easier when making new characters or playing on someone else's account!
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How To Copy Your UI Layout