I’m used to being able to undo my last action in DXO, Photoshop, etc. (Mac OS Command+Z). But TOPAZ AI V2 doesn’t seem to do this.
Making adjustments can be a trial if I forget the original value, make a change I don’t like and then have to re-fine tune to get back to where I was…

Why is the Command+Z disabled in Topaz?

I agree, that would be really helpful. I’ll bring it up with our developers at our next planning meeting.