Exercise 2: Split the Editor — Possible Solution
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STEPS
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1. In the Explorer (Side Bar), click on a file to open it in the
   Editor Group.
2. Open a second file the same way — by default it opens in the SAME
   editor group, replacing or adding a tab next to the first.
3. To actually split into two side-by-side groups: right-click the
   second file's tab and choose "Split Right" (or drag the tab to the
   right edge of the editor area, or use the keyboard shortcut
   Ctrl+\). You now have two Editor Groups, each showing one file,
   side by side.
4. Toggle the integrated terminal open with Ctrl+` (backtick) — the
   Panel appears at the bottom with a Terminal tab active.
5. Toggle it closed again with the same shortcut, Ctrl+`.

WHAT YOU SHOULD SEE
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Two distinct editor columns, each with their own tab strip, both
visible at once — useful for comparing two files or referencing one
while editing another. The terminal panel opening/closing shows the
Panel region growing to occupy the bottom portion of the window and
shrinking back away, without disturbing the Editor Groups above it.

WHY THIS WORKS AS AN ANSWER
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This exercise deliberately exercises two of the five UI regions from
the chapter's concept-grid at once: Editor Groups (by actually
splitting into two, not just switching tabs within one) and Panel (by
toggling the terminal, one of the four things the chapter names as
living inside that region). Ctrl+` is worth remembering specifically
because the terminal is something you'll open and close constantly in
real day-to-day use — a keyboard shortcut is meaningfully faster than
reaching for a menu every time.