In Sibelius, one can simply select the note and press Return (macOS) to flip to the available enharmonic. In Dorico 5.1.50 Operation Manual page 218, enharmonic flips are apparently possible only from the Keyboard window as ‘Respell Using Note Name Above/Below’. However Keyboard Shortcuts (editable in Preferences) ‘Opt =’ and ‘Opt -’ (macOS) enable you to bypass the buttons and have instantaneous effect. The option “Respell notes automatically” can also have a shortcut assigned and this works similarly to the Sibelius Return key (macOS) for a single press (it keeps going South after that as far as triple flats!) I assigned ‘Ctrl Opt =’ (refer screenshots).
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