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Menu → Settings. Most of this you will set once or never. Two sections matter.

Source selection

Three pickers: Primary, Capacity and Sleep. If you wear one device, ignore these entirely. They exist for people with several, and the app has already chosen the only thing available. If you wear more than one, this is worth five minutes — Choosing your sources explains the reasoning, and several wearables through one hub explains why you may see individual devices listed rather than just “Apple Health”. There is also a control to refresh the list of devices and sources, for when you have connected something new and it has not appeared.

CGM Integration

Everything to do with continuous glucose, in one place. It was called Glucose Integration in earlier builds, when Ottai was the only CGM supported.

Settings → CGM Integration, with a Libre 2+ connected

Reading down it: That last line is the one to look at first when something seems wrong. It asks the data rather than the settings — a valid connection and an expired sensor look identical above it and completely different there.
Regenerate secret, under the Ottai row, stops the old secret working immediately. Any bridge app using it goes quiet until you enter the new one. The Workbench itself reconnects automatically, so your own logging carries on — but Ottai will not.
Beneath, a Recovery section holds Test Libre sign-in — which signs in again with your stored password, the same thing that happens by itself when your Abbott session expires — and a field for pasting a secret from elsewhere. You will not need the second one; it exists for the rare case where automatic setup fails.

Backup

Worth reading before you need it. The app backs up automatically, but knowing where the restore button lives is the difference between an inconvenience and losing months of history.
Shows your recent backups and when the last one succeeded. See Backup and restore.

Body composition

If you have had a DEXA scan, you can tell the app what it said, and it will correct your scale’s bias against it. Most BIA scales read consistently high or low; one clinical measurement is enough to calibrate. Skip this unless you have had a scan. A guessed correction is worse than none.

Units

Metric or imperial. Changes kilograms to pounds, and glucose from mmol/L to mg/dL.

Device label

The name you gave this phone, used to label Discovery reports. Editable here.

Daily Journal

The four-slider daily check-in can be reached from here as well as the menu. See Daily Journal.