How do I create dashboard without headers in WHD??

Are you talking about wanting to hide the main site header in dashboard view tlike a NOC view might have?  Or are you wanting individual headers hidden?  For the individual headers, you should have the hide headers option next to the Open Widget Drawer in the upper right corner of the Dashboard screen.  

If the main site header is what you are looking to hide when on the dashboard, I haven't looked into it that much.

If you want that level of control of what is being displayed and better customization of the environment, I would suggest investigating the options you have with the API.

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