I just found that if you go to the base login page, ie for the Not modern interface, and click in the password field, and then press the escape key, the whole login box disappears.
We use a dialog for the UI, so I guess it handles escape button, even though it's marked as not closable.
I just found that if you go to the base login page, ie for the Not modern interface, and click in the password field, and then press the escape key, the whole login box disappears.