If you want to set a blank navigation menu on a particular page, you will have to do the following: 

• Navigate to Appearance > Menu from the WordPress dashboard

• Give a name to your menu and start removing the label of the navigation bar
• Ensure you remove the navigation label and add a “blank space” in the label box
• Click Save to bring changes
• Do this for 5 different labels, otherwise, the menu will not be in proper size.
• Once you are done, you can save it and you will have a blank menu ready.

After that, you can follow this guideline of ‘How to apply custom header in a specific page?”