Practice — Mild · Cockpit Rehearsal

Skills focus. A09's two pages, built with the guardrails up.

Ungraded. Start from your A08 model.

Tasks

Explore page: Year and Region slicers · category bar with the Category → Subcategory hierarchy · monthly line · [Total Revenue] card. Check: drilling into Furniture shows Storage $6.81M leading four near-equal bars.
Audit interactions: Format → Edit interactions, with the bar selected — set the line and card to Filter. Click Furniture: the card must read $24.80M (not a highlighted $66.81M). Click empty canvas to release.
Reset: capture the pristine page as a bookmark ("Reset — Explore"), add a button applying it. Make a mess; press the button; confirm the page comes home.
Category Detail page: drillthrough on Category · the Detail Title measure with SELECTEDVALUE and an "All Categories" fallback · subcategory bar, monthly line, [Return Rate] card, top-10 table. Check: right-click Furniture on Explore → Drill through: title reads "Detail: Furniture", every visual narrows, back button returns.

Hint — my detail title reads "All Categories" after drilling

SELECTEDVALUE sees more than one value — the drillthrough field is not set on the page (check the Drillthrough well in the Visualizations pane), or you navigated by page tab instead of right-click → Drill through.

Reflection

Step 2's click produced $24.80M on the card. Where have you seen that exact number cause trouble, and what on this page now prevents the rerun?
Why does the Detail Title need the fallback argument at all?