Settings and keyboard shortcuts

Make Antimatter look and behave the way you like: themes, display, language and time, and keyboard shortcuts.

Open your settings

Click your picture at the top right of the window, then Profile & settings. You can also press Ctrl+Shift+A (⌘+Shift+A on a Mac), or type /settings. Your settings are saved as you change them, and follow you on every device you sign in from.

The settings are grouped in panes:

Pane	What it holds	See
My account	Your picture, name, username, nickname, position, email and profile details.	Edit your profile
Security	Password, multi-factor authentication, where you are signed in.	Password and multi-factor authentication
Privacy & safety	Who can message you, and the people you ignore or block.	Who can message you
Notifications	Desktop, mobile and email notifications, sounds, keywords, automatic replies.	Notifications and status
Appearance	Theme, display and sidebar.	below
Accessibility	A simplified interface, and colours for people's names.	below
Messages	How messages are shown and written.	below
Language & time	The language of the interface and your time zone.	below
Keyboard	Change Antimatter's shortcuts.	below
Advanced	Streamer mode, developer mode, synced drafts, troubleshooting.	below

Under Plugins, some apps add their own settings, such as Calls for your microphone and camera. If you are a system administrator, the settings also link to the System Console.

Themes and display

Choose a theme

In Settings › Appearance, under Theme, pick Dark, OLED (pure black, for dark rooms and OLED screens), Light, or System, which follows your computer's light or dark mode, even when it changes during the day.

To make your own, click Custom. Under Custom colours, set each colour: Community rail, Sidebars, Chat area, Inputs & cards, Borders, Text, Secondary text, Accent and Links. Start from Antimatter resets them.

Share a theme

A theme can be passed on as a short code starting with am1:. Under Share a theme, click Copy my theme's code and send it to someone. To use a code you received, paste it in the field and click Apply.

Display

Message display: Compact, which fits more on screen, without pictures and with tighter rows; Standard; or Spacious, which leaves more room around messages and in the lists of the sidebar and members.
Availability on pictures: show whether people are online on their pictures in messages.
Share when you were last online: let others see "Last online …".
Message width: Full width, or Centred for easier reading on a large screen.
Show people as: Username, Nickname or Full name, for your direct and group messages. Each community's admins choose how people show in its own channels (see Community settings).
24-hour clock: show times as 16:00 instead of 4:00 PM.
Group unread channels: gather unread channels in an Unreads section at the top of the sidebar.
Topics under a channel: how long a topic keeps showing under its channel after it was last active: 1 day, 3 days, 1 week (the default), 2 weeks or 1 month.

How many direct messages Open conversations lists is no longer a setting here: drag its own top edge instead (see Direct and group messages).

The classic interface

Antimatter's interface is the one this guide describes. If your administrator allows it, Web interface in Settings › Appearance lets you switch to Classic (legacy), the older interface kept for compatibility, and back to Fusion. The choice applies to every browser you sign in from. Menus and buttons differ in the classic interface.

Accessibility

Settings › Accessibility makes Antimatter easier to read and to use. Antimatter also follows your system's reduced motion setting.

Simplified interface: less on screen at once. Buttons and rows are bigger, there are no animations, the member list stays closed until you open it, counts show only for mentions, and fewer buttons show over messages. Everything stays within reach.
Colour names: give each person's name in messages a colour of their own, to tell people apart at a glance. It is off by default, since roles already colour the names of the people who hold them.

Message settings

Settings › Messages sets how conversations look and how you write. Depending on your server, it offers:

Keep replies in threads: thread replies stay in their thread instead of also showing in the channel.
Turn emoticons into emoji: show :) and <3 as emoji.
Times in your time zone: highlight times written in messages, with your own time when you point at them.
Send with Ctrl+Enter: Enter starts a new line, and Ctrl+Enter sends.
Rich text editor (beta): see formatting as it will look while you write.
Under Reading: Open unread conversations at (Where I left off or The newest message), Show images expanded, Link previews (a preview card for websites linked in messages), One-click reactions, Join and leave messages, and Message formatting (turn it off to see messages as plain text).

Language and time zone

In Settings › Language & time, choose the Language of the interface from the list. Antimatter switches at once.

Your Time zone is shown below it, usually set automatically from your computer. To change it, click Change…: this opens the time zone setting in the classic settings window, where you can turn off the automatic time zone and pick one.

Your time zone matters to others too: it is how Antimatter shows them your local time, and warns them when it is night for you.

Advanced settings

Streamer mode: hide your email address and conversation previews, and silence desktop notifications, for example while you share your screen.
Developer mode: add Copy ID to the menus of messages, channels, communities and people, for the API and bots.
Sync drafts: keep the messages you haven't sent yet on the server, to finish them on another device. It is on by default.
Under Performance debugging, when your server offers it: Turn off plugins in this browser and Don't send typing notices, useful when something misbehaves.

Keyboard shortcuts

Press Ctrl+/ (⌘+/ on a Mac), or type /shortcuts, to see the list of shortcuts in Antimatter. On a Mac, use ⌘ where this table says Ctrl, and ⌥ for Alt.

Anywhere

Keys	Action
`Ctrl`+`K`	Search everything
`Ctrl`+`/`	Show the keyboard shortcuts
`Ctrl`+`Shift`+`A`	Open the settings
`Ctrl`+`Shift`+`U`	Hide read channels, or show them again
`Ctrl`+`Shift`+`K`	Start a new direct message
`Ctrl`+`Shift`+`M`	Show your recent mentions
`Ctrl`+`Shift`+`L`	Go to the message box (outside a call)
`Ctrl`+`Alt`+`I`	Show the channel's information
`Ctrl`+`.`	Close the right-hand panel, or show or hide the member list
`Ctrl`+`Shift`+`.`	Expand or shrink the right-hand panel
`Esc`	Close the menu, dialog or right-hand panel
`Shift`+`Esc`	Mark all the community's channels as read
`F6` (in a browser, `Ctrl`+`F6`)	Move between the main areas of the window: rail, sidebar, header, messages, message box, panel

Moving around

Keys	Action
`Alt`+`Up` / `Down`	Previous or next channel in the sidebar
`Alt`+`Shift`+`Up` / `Down`	Previous or next unread channel
`Ctrl`+`Alt`+`Up` / `Down`	Previous or next community
`Ctrl`+`Alt`+`1` to `9`	Go to the first to ninth community

In the message box

Keys	Action
`Enter`	Send (or `Ctrl`+`Enter`, if you chose so)
`Shift`+`Enter`	New line
`Up`, in an empty box	Edit your last message
`Shift`+`Up` / `Down`, in an empty box	Reply to a message, going further back or forward
`Ctrl`+`Up` / `Down`, in an empty box	Bring back the messages you sent before
`Ctrl`+`Shift`+`\`	React to the last message
`Ctrl`+`Alt`+`E`	Open the emoji picker
`Ctrl`+`Alt`+`P`	Show or hide the preview of your message
`@`, `#`, `:`, `/`	Suggest people, channels, emoji or commands; pick with `Tab` or `Enter`
`Esc`	Cancel a reply

When you edit a message: Enter saves, Shift+Enter adds a new line, and Esc cancels.

In a call

Keys	Action
`Ctrl`+`Shift`+`Space`	Mute or unmute
`Ctrl`+`Shift`+`Y`	Raise or lower your hand
`Ctrl`+`Shift`+`E`	Share your screen
`Ctrl`+`Shift`+`L`	Leave the call
`Ctrl`+`Shift`+`P`	Show the call in a floating window
Off by default	Push to talk (hold the key)

Change a shortcut

Open Settings › Keyboard.
Click Change next to an action, then press the new keys. Press Esc to cancel, or Backspace to turn the shortcut off.
If another action uses the same keys, the page warns you: "Another action uses these keys too".
Click Reset to go back to the original keys.

You can change the shortcuts for searching, the list of shortcuts, the settings, the unread filter and the calls. The others stay as they are. All keyboard shortcuts… at the bottom of the page opens the full list.

In the desktop app

The desktop app adds shortcuts of its own, shown in its menus: for example Ctrl+F to find text in the page, Ctrl+= and Ctrl+- to zoom, Ctrl+0 for the actual size, Ctrl+R to reload, Alt+Left and Right (⌘+[ and ] on a Mac) to go back and forward, and Ctrl+Shift+1 to 9 (⌘+Ctrl+1 to 9 on a Mac) to switch between servers.