can't close Audacity with keyboard

(Audacity 2.1.2, iOS 10.12.4, MacbookPro)

When I finish using Audacity, I press CMD-W to close the window (or CMD-Q
to quit the app).

Audacity asks "Save changes before closing".  By pressing TAB I can
"select" Yes, No or Cancel - but to no avail!  When I press Enter, Audacity
insists on saving the current work.

Can this be improved?

(Not wanting to save the work is quite common.  If one loads in a file,
plays it, makes no alteration, and exits the app, there is no point in
rewriting it to disk.)

​Thanks for previous help!   Tony​

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