Hi @Kay McAuley
Welcome to the Community!
It's a bit confusing, copy & paste doesn't work, well it does at card level, but not list level. You have to copy the list (make another one) and then move that one.
If you're trying to copy a list from one board to another (as in make an exact copy), click 'copy' on the list, rename it to whatever you want (so that you know they're 2 versions, otherwise you might move the wrong one).
You should then have an exact copy of the original like, then on the new list, click the 3 dots and click 'move' and pick where you want it to go!
That'll give you an exact copy of the list on 2 boards (however, if you add cards or change anything on any of them in the original list, these won't appear on the copied list).
Hope that's helpful!
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