Hi,

Sorry, but there is no such option. 
You could of course style it with a bit of CSS. This CSS snippet can get you started:

@media (max-width: 991px) {
 header.header-classic .to-x {
     position: fixed;
     top: 15px;
     right: 15px;
     z-index: 111;
 }
}

Paste it in the Theme Options -> Custom CSS and adjust it as needed.

Kind regards,
Andrej

Saadly there is no sticky header on mobile on Dentalia.

I personally like a huge phone in my hand, but there are many who have really small devices and when the sticky header takes one third of the available screen space, reading the content of web page on such device can be a painful experience. Saving the screen space is the main reason why we didn't implement a sticky header for mobile devices. And we do not recommend to use it either.

It is however possible to make the sticky header visible on mobile too with some CSS. The CSS below might be a good start, but it does require some additional styling for sure. 

@media (max-width: 991px) {
 header.stickymenu {
 z-index: 11;
 width: 100%;
 }
 header.stickymenu .nav-container {
 max-height: 60px;
 height: 60px;
 }
 header.stickymenu .site-navigation {
 display: none;
 }
 header.stickymenu .logo {
 margin-top: 0;
 margin-bottom: 0;
 }
 .top-bar {
     margin-top: 60px;
 }
}

Kind regards,
Andrej