The Preview
The tab always shows a live Preview of what you'll actually get — built from the first real playlist (or first group) this rule produces, with real numbers, never lorem ipsum. The caption under it tells you what you're looking at:
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"Previewing the first playlist this rule produces."
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"Previewing the first group — one title slide is generated per group." — when a count/percent sort rule is attached.
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"Previewing the selected slide — use the pencil to edit it." — in custom mode.
Tweak a color or swap the logo and the preview redraws immediately.