Stealth Mode currently needs to be turned on and off manually through the Settings menu. There doesn't appear to be an automatic activation option at this time.
To turn Stealth Mode on or off, you need to:
Tap the Settings cog icon on the top right corner of your Home Screen
Scroll down to Preferences
Select Stealth mode
Toggle Turn on Stealth Mode on or off
If you'd like to see an automatic Stealth Mode feature added in the future, you can share this feedback with our team at hello@wemoney.com.au or the chat feature. We're always looking for ways to improve the app based on user suggestions.