Removing Navigation Bar

My current version of my website has a navigation bar, one that I have to click before I can even view my pages (http://supernovathemes.com/powen/ like in the top left of this website). However, I would like my pages to just appear in the header without having to click any navigation bar to navigate through (https://www.competethemes.com/apex-live-demo/) like this.

Is there way to convert it?