To hide and unhide chats on Viber for mobile devices, follow these steps:

Hiding a Viber Chat

  1. Open the Viber app on your mobile device (iOS or Android).
  2. Navigate to the chat you want to hide.
  3. Swipe left on the chat (iOS) or long-press the chat (Android) and select "Hide" from the options.
  4. If it's the first time you're hiding a chat, you'll be prompted to set a four-digit PIN for all future hidden chats. Enter the PIN and confirm it.

Unhiding a Viber Chat

  1. Open the Viber app on your mobile device.
  2. Tap the search icon (top right corner) and search for the person whose chat you want to unhide.
  3. Type the person's name into the search bar.
  4. Open the chat by tapping on the person's name.
  5. Tap the person's name at the top of the chat to open their profile.
  6. Scroll down and tap "Unhide this chat."
  7. Enter the four-digit PIN you set for hidden chats.
  8. The chat will now be unhidden and visible in your main chat interface.

Please note that this process is for mobile devices; Viber's hidden chat feature is not available on desktop or tablet versions.