Ah - whoops! I forget which order I introduced those new features, but apparently I never tested one using the other. It probably wouldn’t be too hard to fix, but given that anyone using the mouse to aim should have a button available to click at least once, even players who favour keyboard controls should be able to dismiss it.
In hindsight mobile players may struggle to get rid of the right-click tutorial, but I’ve already flagged it as not-strictly-supported so I figure that’s less of an issue.