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The blue box to drag to the content to delete does not move anywhere to delete.
Hope you are doing well. As per the description I understand that you want to edit a document and are unable to to. I am sorry to hear about the experience.
Could you please confirm if the issue you are facing with a specific document file or with all the files?
It could be that the file you are trying to edit has editing option disabled by the creator in the properties of documents.
Also while you check for the properties, can you share a screen recording of the work flow that you are following so that we can check and assist you better with the exact answer on this.