I don't click the buttons. To my mind, the manner in which the 'Apply' buttons react to the Enter key means they're rebranded OK buttons. If a button branded 'Forget it' reacts to the Escape key by discarding changes then its a Cancel button.
@theducks - it's not 'just a menu'. It's a matrix of icons that must be activated with a pointing device such as a trackball, mouse, whatever. If it were a calibre toolbar/menu, I could assign keyboard shortcut to each settings panel, and discard those I don't use such as Send to device, Metadata plugboards etc. And if I put it in a context menu, then heavens above… I could drive it from the keyboard.
BR
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