Anki has a special “Default” deck that automatically hides itself if you both:
- Have created your own decks
- Have no cards in the “Default” deck.
I think you renamed “Default” to “science”, so you actually do have a “science” deck, it’s just hidden.
Here’s a little trick to make it reappear:
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Open the “Add” menu
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Select the deck
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Choose “Add”
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Type “science” (no plus, all lower case)
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Press “OK”
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Just put anything in the front field of the note (we are not allowed to create empty notes)
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Press “Add”
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Close the “Add” window
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Tada! The invisible “science” deck should have reappeared.
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Rename “science” back to “Default”
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Delete the note we just made (“Default” will disappear again)
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Rename “science+” to “science”