It is not necessary to log out of Huddle to keep your information secure. By default, Huddle will require your PIN code, FaceID, or Fingerprint (if you've set those up, learn how here) each time you log in. If you would like to fully log out, follow these instructions.
From the Home page, tap on the avatar (circle with initials in the top right.)
Tap "Settings & Preferences"
Tap "Log out" under Security, and follow the steps to fully log out (Note: You will have to re-enter your email or phone number and a verification code to login again.)
That's it!