I think that the text is wrong because you are not crafting. You are smelting. It would make sense if it says "Showing smeltable" or "Showing cookable" rather than "Showing craftable." Also, instead of the crafting table icon on the filter button, why not a furnace icon?
MC-125608
Recipe book filter in furnaces says "Showing craftable"
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However, this issue is a Duplicate of MC-124956.
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