Deck disappearing from "Decks"-page

One of my decks suddenly disappeared from the “Decks”-page on Anki (desktop) on my MacBook Pro (macOS Big Sur).

I believe it happened after I pressed the sync button on Anki on my iPhone.

The deck itself can not be found, but all its cards can be found in the “Browse”-page.

Maybe it had a parent deck, and you’ve collapsed it? Look for plusses, +, to the left of your decks’ names, and click them to reveal child decks.

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Thanks for your suggestion. I have already checked. When I expand all decks the specific deck I’m looking for can’t be found. I can’t figure out why.

Edit: I found a solution. The deck appeared after I clicked on Tools > Check Database.