If you've launched into the wrong Form, or tapped on the wrong appointment, and need to exit Form filling, look for the mostly-hidden exit button. It's usually in the bottom right-hand corner of the screen, but it's on the bottom left-hand corner on the Welcome screen. So let's see some examples.
From the Welcome screen
The exit button is in the bottom left-hand corner of the Welcome screen.
From the Summary screen
On the Summary screen, you can find the exit button in the usual place: the bottom right-hand corner.
From any other screen
On any other screen, it's still in the bottom right-hand corner.
Confirmation & passcode
Don't worry if this button is accidentally tapped. A a confirmation dialog ensures you don't discard all information without wanting to.
After discarding, you'll be prompted for the app passcode once more to get back into the Administration Area.