How do you merge decks in Anki? I'm getting an error in Anki that says I've got too many decks.  So, I want to merge a bunch of decks that are essentially the same.  But I can't find a way to do this.  I tried exporting the decks and naming them all the same name and then importing them, but they just come in as the original deck names.  So, I'm not finding any other info on how to do this.
Open AnkiDesktop.
Open the "Browser".
Click on the deck you wish to remove on the left-hand pane.
Hit ctrl+a (command+a on mac) to select all cards.
Click "Change Deck" at the top.
Select the deck you want to keep in the pop-up dialog.
Click "Move Cards".
Repeat steps 3 - 7 for all decks you wish to merge.
Go back to the "Decks" screen in AnkiDesktop.
Find the empty decks (the decks you wish to remove will have a card count of null).
Delete those decks.