Exercise 1: Change Your Theme by Command — Possible Solution
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STEPS
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1. Press Ctrl+Shift+P (Cmd+Shift+P on macOS) to open the Command
   Palette.
2. Type "theme" — the fuzzy search should surface "Preferences: Color
   Theme" near the top of the results within the first few
   keystrokes.
3. Press Enter (or click it) to select that command. A list of every
   installed color theme appears, with a LIVE PREVIEW — the editor's
   colors change in real time as you move the selection up and down
   with the arrow keys, before you've even confirmed a choice.
4. Pick any theme other than the current default and press Enter to
   confirm it.

WHAT TO NOTE
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The live preview while browsing (before confirming) is a nice detail
of how the Command Palette handles this particular command — not
every command previews like this, but theme selection specifically
does, making it easy to try several before committing.

WHY THIS WORKS AS AN ANSWER
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This exercise deliberately forces practicing the Command Palette
workflow described in the chapter: rather than knowing (or guessing)
that themes live under a "Preferences" menu somewhere, typing a
plausible search term ("theme") and letting fuzzy matching do the
rest reaches the same destination faster and without needing to
memorize any menu location — exactly the "discoverability without
memorization" point the chapter makes about why keyboard-first
navigation matters.