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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I had the same problem. Go to the navigation on the left on the second icon "Kata" and you will find a search field on the left top side of the new screen. Try to find with keywords of your lost kata.