Exercise 3: Turn On Settings Sync — Possible Solution
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STEPS
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1. Click the accounts icon in the bottom-left corner of the Activity
   Bar (a small person-shaped icon) — or open the Command Palette
   (Ctrl+Shift+P) and run "Settings Sync: Turn On."
2. Sign in with a Microsoft or GitHub account when prompted, per this
   chapter's own description of how Settings Sync authenticates.
3. A panel appears listing the categories available to sync:
   Settings, Keybindings, Snippets, Extensions, and UI State — each
   with its own checkbox/toggle.
4. Confirm which are currently checked (by default, typically all of
   them are enabled).
5. Click "Turn On" (or equivalent confirm button) to finish enabling
   sync.
6. To verify afterward, open the accounts icon menu again — it now
   shows "Settings Sync is On" (or similar), along with the same list
   of enabled categories, confirming the state persisted.

WHY THIS WORKS AS AN ANSWER
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This reuses the chapter's own two described entry points (the
accounts icon, or the Command Palette command) interchangeably —
either one reaches the identical Settings Sync setup flow.

Explicitly checking which categories are enabled (rather than just
turning it on and trusting it) directly ties back to this chapter's
own list of exactly what Settings Sync covers: "settings, keybindings,
snippets, installed extensions, and general UI state." Confirming this
list matches what the exercise found is what proves the earlier parts
of this chapter — the custom snippet from Exercise 1, the rebound key
from Exercise 2 — will actually follow to a new machine once signed
in there too, rather than staying stuck on just this one.