Hi. Not sure if anyone will see this! I too want to change the Twitter acciount my Spotify is linked to, but when I right click I no longer see the screen you refer to. I simply get a panel of buttons with no cog and no ability to change!
Same. And I see no replies yet. (Sigh). I went into my Twitter and disconnected my Spotify authorization, but Spotify still wants that account and won't reauthorize so it can be changed. No settings change in the sharing list, and it looks totally different than before. Stalemate.
The step Per had been tell us before is no longer, yet there is no official statement confirmation about this. I'm now facing the same problem, yet revoking access from my old twitter account is not working.