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In "Interact" mode, pressing arrow keys fires a navigate[] event to the current card. The default navigate[] event handler flips between cards:

on navigate x do
  if x~"right" go["Next"] end
  if x~"left"  go["Prev"] end
end 

But you can override this behavior in the deck-level script to do nothing instead:

on navigate do end

See "consider a custom navigate event" here for another example: https://ahmwwmaaa.neocities.org/decker/phield-notes#publication