It seems like you prefer to keep the navigation menu from converting into a mobile drop-down. Do you want the navigation to always be a full-width dropdown instead?
If you wish to maintain the desktop navigation layout for as long as possible, you'll need to focus on the media queries.
You will come across the following code snippet:
@media only screen and (max-width: 767px)
Pay attention to the selectors called: #navinti and #mobilenav
You should ensure that #navinti remains visible, while disabling #mobilenav at the same time
Currently, they are defined as follows:
#navinti {
float: none;
...
}
#mobilenav {
display: block;
...
}
Modify it to:
#navinti {
float: left;
...
...
}
#mobilenav {
display: none; /* Consider using !important with this */
...
}
In #navinti, remove the following properties:
background-color
-moz-box-shadow
-webkit-box-shadow
box-shadow
If your navigation menu is not wider than the template's, you should be able to apply this adjustment until 500px (width), then you may need to adjust padding & margin to fit within 460px width. However, if your navigation menu has only a few items, it may be challenging to fit it onto a mobile screen.