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Are you referring to the color themes? If yes, you can check this article for more info: https://helpx.adobe.com/express/using/color-and-express.html
Also, if you are trying to move your old files, check this post & try the steps mentioned in it: https://community.adobe.com/t5/adobe-express-discussions/updates-for-the-new-adobe-express-as-of-aug...
Let us know if that helps.