Exercise 1: Finding a Setting That Still Requires Control Panel — Possible Solution
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A REAL EXAMPLE THAT STILL REQUIRES CONTROL PANEL
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Advanced network adapter properties are a genuine, commonly-hit example.
Settings > Network & internet > Advanced network settings gets you
adapter status, basic IP configuration, and a "More adapter options"
link - but that link itself opens the classic Control Panel "Network
Connections" window (ncpa.cpl), because the adapter-level configuration
dialog (speed/duplex settings, advanced driver properties, protocol
bindings) was never rebuilt for the Settings app at all.

WHY THIS IS THE EXAMPLE THE CHAPTER POINTS TOWARD
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Per this chapter's own "Settings vs. Control Panel" section, the
migration from Control Panel to Settings "still isn't complete," citing
"advanced network adapter properties" by name as one of the specific
areas that "genuinely only exist in Control Panel today." This isn't a
hidden or obscure corner case - it's one of the first places a real
support task (troubleshooting a slow or misconfigured network adapter)
runs directly into the gap.

HOW TO CONFIRM WHETHER A SETTING HAS FULLY MIGRATED
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The reliable method is to actually follow the relevant Settings page's
own links to their end rather than assuming Settings alone covers
everything. If a Settings page includes a link labeled something like
"More options," "Additional settings," or "Related settings" that
opens a window with an old-style title bar and a different visual
style than the rest of Settings, that's Control Panel opening
underneath - a clear, checkable signal rather than something that has
to be guessed at or memorized in advance.

WHY THIS WORKS AS AN ANSWER
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It names one concrete, chapter-cited example of a Control-Panel-only
setting, ties it directly back to the chapter's own stated claim, and
gives a real, repeatable method (following a page's own "more options"
links and watching for the visual-style change) for confirming the gap
on any given setting rather than relying on memorization.