Pin a conversation
Some chats stay useful long after you start them. A project brief or a chat you use for a recurring task is easy to lose once newer conversations push it down. Pin the chat, and it stays at the top of your list.
You can pin a chat from the chat itself or from the sidebar.
From the chat

The grid button at the top right of the conversation opens the chat actions. Choose Pin, and the current chat moves to the top of your conversation list. A small pin appears next to its name.
From the sidebar

Hover over the chat in the sidebar and click the three-dot button that appears on the right. Choose Pin from the menu, and the chat moves to the top of the list, marked with a pin.
What pinning does
Pinning lifts the chat above your recent chats, so it is easy to find even when the list gets long. Everything in the chat stays as it is. If you pin more than one chat, the most recently updated one comes first.
To unpin a chat, open the same menu from the chat or from the sidebar and choose Unpin. It goes back to its place among your recent chats.
On a phone
On a phone, the sidebar is a drawer that you open from the menu button at the top left. You can pin the open chat with the grid button at the top right, or pin any chat from the drawer by tapping the three-dot button beside it. Open the same menus to unpin.