Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :-)
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Unfortunately, There is no option in Theme Settings available where you can add the all the demo layout to your website. The demo Layouts are only for the ThemeForest website to enable the users to view all the available layouts.
If you are trying to ask anything else then provide with some relevant screenshot of the specific area to check it myself and help you out accordingly.
Best Regards.