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Don't know either. I saw this a while back myself too and assumed that IPB would fix it themselves at some point, but obviously they have not. Looking at the template, it seems like the MFA screens were designed before a recent theme overhaul. Namely, they use a "ipsModal" CSS scheme when it seems they need to move to "ipsDialog". It's also missing out on color changes as the popup on dark theme isn't using the correct background colors (but it's still fine). I've made that change for the authentication popup: it's still rather wide but I think it's definitely better now.