How to Delete Viber Messages: A Complete Guide 
Introducing Secret Messages
How to Hide Viber Chats
Share Extra Confidently with Secret Chats
On Android, you need to tap on the chat in question and hold for some time, and then select the Hide option.
Just tap on the option of your choice and delete the message for just you or everyone in the group.
Keep in mind that you will be able to enable this feature on both one-on-one conversations, but also on a group chat.
This new feature will prevent screenshots and at the same time it will allow messages or videos to delete themselves after a period of time.