Bury all new cards of a deck
This has to be done manually. Click on the deck, and then on Custom study. Select Study by card state or tag, then New cards only and select a number of cards sufficiently large to pull all new cards from the deck. Click on Choose tags. In the Selective Study window, select tags if needed, then click on OK.
A new Custom Study Session deck is created. Start studying, and bury every
card when shown. You can do this quickly by pressing the -
key repeatedly.
Then delete the Custom Study Session deck.