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You have probably solved this (it's been six years now) but I'm answering in case someone else wants to know.
Below the drawing window there is a ribbon. On the left it say Sheet1, right click on that and select Setup. Then uncheck the box that says Show Format
Much better way to deal with that problem then deleting the formats. I'm actually going to test if I can do this in my sheet metal start part.
I've been looking in to mass exports of DXF's and this was a bit of a problem.
A much better way is uninstalling Creo and using anything else.
