Settings opens under your avatar, or at ⌘, (Ctrl+, on Windows). Account is the first section along the top, and it is the shortest: who you are, how Brief looks, and how to leave.

Identity
Four fields, and they are not decoration. Brief writes on your behalf and prepares you to meet people, so it needs to know which person in your email is you.
- Display name is what Brief calls you.
- Job title and Company give Brief your vantage point. The same thread reads differently to a CFO and to a head of sales, and this is what tells Brief which one is reading.
- Work email is the address Brief treats as yours when it works out who owes what to whom.
If your name or title changes, change it here. Brief's writing picks it up on the next generation rather than needing anything rebuilt.
Appearance
Brief ships dark. As the setting says, "Dark is the default. Light respects your system preference when no choice is set."
Read that second sentence carefully, because it explains a thing people report as a bug: until you pick a side, Brief follows your operating system, so it can change under you when your Mac or phone switches at sunset. Pick light or dark explicitly and it stops moving.
Mode is only the first control in this card. Under it sit Theme — Slate, Beachday, Rebel, Pacifica and Forest — and then the layout choices: whether the navigation runs Vertical or Horizontal, whether chat docks Left, Right or Bottom, whether Today opens with the agenda showing and how far ahead it looks, and whether section view controls stay visible or wait for a hover. None of them change what Brief does; all of them change how much of it you are looking at.
Sign out
"Sign out of Brief on this device." That is the whole scope — this device, this browser. Your other sessions keep running.
Brief asks you to confirm first. If what you actually want is to end a session somewhere else — a laptop you no longer have, a browser you used once at a conference — that is a different control, on the Privacy & Security screen. See Privacy and security settings.
Delete account
At the bottom, deliberately: "Permanently delete your account and all associated data. This cannot be undone."
There is a confirmation dialog, and it is the last thing standing between you and an irreversible deletion. Before you use it, two things are worth knowing. Deletion has a defined scope — what goes, and what was already in your own systems and stays there. And if you want a copy of your records first, Brief has no export button; the way to get one is to ask a connected assistant to list them and write them out. Both are covered in Account and data control and Delete your account and data.
If you only want Brief to stop emailing you, you do not need this. Turn off the daily briefing email under Tuning your daily brief, or disconnect a source under Connection settings.