Remove Fixed Header Top DropDown

I hope I'm being clear in this question and asking it correctly. In my primary menu, there is an space at the far right to add a company logo. And at the far left, there are three small lines that when clicked, can open up a logo or... nothing. I want to keep the righthand logo but don't really want the lines- not sure what they are called- or how to remove them from the menu. I've played around in Customize to no avail. Any advice as to how to remove this option? website: http://terrapin.tech Thanks