Limit small-multiple panels to message-relevant categories

Limit small-multiple panels to the categories that support the takeaway. For example, remove extra panels when readers would otherwise have to scan dozens of categories or scroll a long way on mobile, and move a complete view into a searchable table with sparklines if all categories must remain available.

Panel count controls how much scanning work the layout asks of readers. Fewer panels focus attention on the intended takeaway instead of turning the chart into an unguided search.

Mechanism: Reducing panels shortens scanning and scrolling, especially on mobile, and keeps the visible set aligned with the story the chart is trying to tell.

Evidence: The post advises keeping fewer panels than you initially plan, choosing the ones that support the point, checking mobile scrolling, and using sparklines in a searchable table if all categories must be shown (Muth, 2024).

• User Goal: Show the key categories in a story-driven small-multiple display.
• Data: Many categories, each with its own line panel.
• Chart Setting: A panel grid that may require long scanning or mobile scrolling.
• Success Criterion: Readers reach the main takeaway without hunting through dozens of panels.

Break it when: You need to show all categories rather than a selected story-supporting subset. Why: Removing panels hides part of the data; a searchable table with sparklines is the suggested fallback.

Sacrifice: You give up complete in-chart coverage of every category. Risk: Cutting too aggressively can stop the chart from giving a truthful picture of the situation. Mitigation: Keep the panels that support the point while still preserving a truthful overall picture, or move the full set to a searchable table with sparklines.

Mistake: Show dozens of panels and ask readers to find the interesting bits on their own. Why it fails: The chart becomes a long scan, especially on mobile.

Failure Sign: The chart takes a long time to scroll through or feels like a search task. Quick Check: View the chart on a mobile screen; if it takes long to scroll through all panels, you still have too many. Stronger Test: Remove panels until the remaining set still supports the intended takeaway and still gives a truthful picture.

• Remove categories that do not support the intended takeaway.
• Check the chart on a mobile screen and reduce panels until the scroll is manageable.
• If all categories must remain available, move the complete set into a searchable table with sparklines.