Thank you!
Test mode only meant for site admins during setup, and what it does is ignore the cookie that is set to see if the box was closed already. You should normally not leave this option on for extended periods of time and it’s applied to all boxes at once by design to enable you to test how things would work for new visitors that don’t have any Boxzilla cookies set.
Hope that helps. If you have any questions, please let me know!