You can hide chats, but you can't delete chats from your device. These changes will only be visible on your own device.
To hide a chat:
Select and hold the chat you want to hide. At the top of the screen, tap the hide icon that appears.
On iOS, swipe left on the chat you want to hide. Select Hide.
Unhide a Chat
- Go to the main menu (or swipe right) and tap Archive. Your hidden chats are displayed.
- Select and hold the chat you want to show. Select Unhide.
Note: This feature is not available on Windows Phone 10.