I have a very minor bug in AD2 where the undo does not work when altering the colour inside the Edit Global Colour, which does in AD1. I often change the colour to check where I have used the global colour - so romp up the mag or cyan to max and see if the colours are used in the right places and then quickly hit cmd-z. This is no big deal as you are able to undo once you are completely out of Edit Global Colour. Mac OS Monterey 12.6.