I currently have the problem that I cannot see the security level of emails on Android, and I assume this also applies to iOS.

On the desktop, you can see whether an email was simply stored using zero-knowledge encryption or received encrypted using PGP (green lock). This lock symbol is completely missing on Android, which makes it difficult for me to determine how the email reached me from my communication partners.

This would be an important feature and would bring the app in line with the Windows desktop app.