By default, all Zenly users, friends, and non-friends can send you both messages and friend invitations. If you enable Private Mode, only your Zenly friends and people in your phone address book will be able to contact you (send friend invitations, chat messages and emojis). Likewise, you will only be able to contact your current Zenly friends and people in your phone address book using Zenly but not yet your friend.
To enable Private Mode:
1. Go to your profile
2. Tap on the settings gear icon⚙️ in the top right corner
3. Select the option "Private Mode"
4. Tap the button "Enable" to activate the mode
You can disable/re-enable Private Mode at any time by following the above steps.