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Read is light. Unread is bold. Blue means you were mentioned.
Comparison of read, unread, mention and high-count mention states for Conversations and Threads sidebar labels.

Read, unread and mention states in the Conversations and Threads sidebar tabs.

Open and organize conversations

Conversation menu

Change folders, notifications, members, archive, or leave.
Go

Right-click a conversation in the sidebar, or hover it and click its … button.

Note

Mute or change notifications: Notifications > All new messages, Just mentions or Mute (DMs: All messages or Mute); Edit default settings opens Settings > Notifications.

Threads

Find threads you follow.
Go

Chat → Sidebar → Threads tab

Note

You follow a thread automatically when you start it, reply to it or are mentioned in it.

Message yourself

Keep private notes and links.
Go

Press Cmd/Ctrl+K, type your name under People and pick it.

New DM

Start a DM or group DM.
Go

Press Cmd/Ctrl+Shift+K.

Note

DM an agent: Cmd/Ctrl+K > Agents > pick it, or Message on its profile.

New channel

Make a public or private channel.
Go

Press Cmd/Ctrl+Option/Alt+K.

Who

members who can create channels

Note

After creating, the Add to #channel step offers Add people, Add agents or Send invites, or Skip for now.

Browse channels

Find public channels and join them.
Go

Sidebar Browse or create > Browse channels.

Conversation page

Read and send messages.
Go

Chat → Conversation

Note

Open channel details: click the title or the members button.

Key

Jump to latest: Cmd/Ctrl+Down

Channel details

Manage members, files, automations, and channel settings.
Go

Conversation → Header → Members button

Note

Add people or agents: Members tab > Add members.

Thread panel

Reply to one message without splitting the main conversation.
Go

Hover a message > Reply in thread, click its reply count, or press T on a focused message.

Note

Follow or unfollow: Thread actions > Turn on notifications / Turn off notifications.

Inbox

See messages that need your attention.
Go

Click Inbox in the left rail or press Cmd/Ctrl+Shift+A.

Note

Archive an item to clear it; find it again under the Archived tab.

Key

Next inbox item: J

Find messages, people, channels, files, and transcripts.
Go

Web: Search in the left rail or Cmd/Ctrl+K > Search.

Note

The bare / key no longer opens search.

Send and manage messages

Composer

Write, format, attach, mention, and send.
Go

Conversation → Composer

Note

Markdown works for bold, italic, strikethrough, code, code blocks, quotes, lists and links. Headings are not supported.

Key

Insert line break: Shift+Enter

Message actions

React, reply, forward, edit, copy, pin, or delete.
Go

Hover a message for the toolbar; More actions or right-click opens the full menu.

Note

You can edit and delete your own messages; members with write access can delete their workspace agents’ messages.

Key

Next message: Down

Forward a message

Send one message to another person, agent, or channel.
Go

Message → Forward

Work live

Jams

Start or join a live audio room.
Go

Click Start Jam in the conversation header, or press Option/Alt+Shift+J.

Note

Choose recording before you start, in Open Jam settings.