Hi there,
I'm trying to set up an IMAP account in Nylas Mail, but the option doesn't appear.

I downloaded the Nylas N1 and there's an IMAP option in the setup. I don't know if this is related to the version I downloaded or if it is a bug.
I'm using the macOS version 1.0.30 (1.0.30) in Sierra.
It's found in the Nylas Mail menu bar > Add custom IMAP Account...

Granted, it would be more user friendly if it was added to the list you showed.
Thanks! You saved my day!
Why need to hide this button??????????????????
Most helpful comment
It's found in the Nylas Mail menu bar > Add custom IMAP Account...

Granted, it would be more user friendly if it was added to the list you showed.