This looks like an instance of your Drawing Sheet being set to display in the view. If you navigate to File> Print> Drawing Sheet Setup, is the Show Drawing Sheet in View checkbox checked? If so, go ahead and uncheck this option and test to see if the gray background disappears.
Software errors in Home Designer Suite 2021; floor plan background goes grey
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This looks like an instance of your Drawing Sheet being set to display in the view. If you navigate to File> Print> Drawing Sheet Setup, is the Show Drawing Sheet in View checkbox checked? If so, go ahead and uncheck this option and test to see if the gray background disappears.