Hello,
First of all thanks for choosing our Theme, we are glad to be you in WoodMart WordPress family :-)
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You do not have to edit the header.php file because you can edit your header from WoodMart >> Header Builder >> Your default header >> Menu in your top bar row. That menu displays a set of menu items in that row. So if you don’t want it just remove the menu element and save the changes.
Also you need to revert the changes which you made in your header.php so the top bar will display.
Best Regards.