All header setting can be managed through the theme options. Follow the video tutorial.
By default, the menu navigation of the site, is boxed but through the switch-options you can turn it to full-width.
Between the top header and the menu there is a color gradient that you can turn off by the switch-options
Love Travel has a palette of 6 colors (which you can set in: Theme Option> Color Settings) and more greys and in this dropdown you can choose the background color of the menu navigation between these colors.
The Sticky Menu works when in the website the menu is locked in the upper part of the page so that it does not disappear when the user scrolls down the page; in other words, it is accessible from anywhere on the website without having to scroll. By default the menu is sticky and you can disable it putting the value -200.
If you enable the “left/right Sidebar” you will add a button in the header that will open a sidebar. You can set the content of this sidebar in: Appearance > widgets > and set your widgets in the “left/right sidebar”.