Ash here from the Shopify team. Welcome to the Shopify Community!
I'm happy to help out with disabling your Christmas pop up. I'm going to need a bit more information first to determine how it was enabled in the first place. Could you please reply back here and provide the following details:
Once I receive your reply with the above information, we should have a better idea of how to proceed with disabling the no longer needed pop up. Looking forward to hearing back!