Users want to see all matchup guides simultaneously on a sideboard guide detail page, instead of selecting one at a time. This was a feature in V1.
Feature:
A toggleable "multi-matchup view" mode on desktop. When activated, DeckV2ListView is frozen/sticky on the left, and all matchup guides are displayed as GuideV2Listview instances in a horizontally scrollable carousel to the right. SideboardMatchupSelector is hidden since all matchups are visible.
Editing:
Owners can edit in multi-matchup mode. Clicking a guide sets it as selectedMatchupGuideId, enabling editing for that guide only. Non-owner viewers can see all guides but cannot edit.
MatchupPrimer:
Accessed via a new button in each GuideV2Listview that opens a Shadcn Dialog/modal. Not rendered inline in multi-matchup mode.
Below carousel:
SideboardPrimer, DeckAnalysisSection, DeckSampleHandSection, TokensSection, SideboardFAQ, DeckKeepOrMullSection, YouTubeEmbed.
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FILES TO MODIFY:
  • sideboard-view.tsx — conditional multi-matchup layout (lines 885-1033)
  • multi-matchup-carousel.tsx — NEW: DeckV2ListView (sticky left) + N GuideV2ListViews in ScrollArea
  • guide-v2-listview.tsx — add MatchupPrimer dialog button
  • deck-ui-store.ts — add isMultiMatchupView persisted toggle
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ACCEPTANCE CRITERIA:
  • Toggle button on desktop (hidden below xl), always visible even with 0 matchups
  • View preference persisted across sessions
  • DeckV2Listview sticky on left, all guides in horizontal ScrollArea
  • Uniform guide widths (min-w-[280px] max-w-[350px] w-[300px])
  • Clicking a guide enables editing for owners (visual ring indicator)
  • "Add Matchup" button at end of carousel for owners
  • MatchupPrimer button on each guide opens Shadcn Dialog
  • Supplementary sections below carousel
  • No regressions in single-matchup flow
  • Mobile view unchanged
  • Type-check passes
Complexity: Medium — no backend changes, all core components exist.
Related: "matchups side-by-side" post