If you have archived a chat, you can move it back to the Start page (“unarchive” the chat) as follows:
- Click on the Chats icon at the bottom in the app.
- Click on the menu icon in the top left corner of the Chats page.
- Select “Archived chats”.
- Open the chat page.
- Click on the menu icon in the top right corner.
- Click on “Move to start page”.