Can't Log In To Second Account

I have two homes using SmartThings. I set up separate accounts for each, using different email addresses. I used to be able to switch between them on the iOS app by logging out, and then logging back in using the other account.

Now I can’t do that. Instead, the iOS app always remembers the last account I used, and doesn’t provide a way to enter a different email.

How do I specify a different email account when logging in?