docs-site/faqs/hiding-decks.mdx
If you do not intend to study a deck for some time do not want to delete it, you may wish to hide it. There are two ways to do this.
A) Export the deck and delete it.
Anki Deck Package (*.apkg) from the Export Format drop-down.You can restore the deck to your collection by choosing File → Import and importing the deck again. It will be restored with the same name it had when you exported it.
B) Create an "unused" deck.
You can create a tree of decks in Anki by dragging and dropping the decks in the deck list. You can use a combination of this property and options groups to hide decks you do not intend to use:
To restore the deck, simply drag and drop it back into the main deck list (you can go either to the very top or the very bottom of the list to get the top level). You can leave the Unused deck for future use.