1. The preferred method is to turn off the theme for any webpages that you are using as landing pages. This will automatically remove the header, footer, and menubar (navbar).
2. You can choose "Settings" -> "Administrator" from the main menu in your AllProWebTools account. From here you will find the Theme Editor on the left side of the screen where you can click on "Header". Here you can comment out or remove the code that relates to the menubar. Here is a video that will show you how: