Hello,
there is already a topic / solution for this problem, but i don't understand the workaround.

www.joomlaplates.com/forum/j3-aio/8947-s...n-in-desktop-ansicht

Where i must change the code?

Thanks for your help.

Best regards
Tobi

Add this css code to your css/custom.css
www.joomlaplates.com/support/documentation/custom-css-in-joomla

/*menü auf Desktop ausblenden mob_menu*/

a.uk-button.uk-navbar-toggle.uk-float-right
{
display: block; /* This is how it looks on mobile */
}

@media (min-width: 750px) {
a.uk-button.uk-navbar-toggle.uk-float-right
{
display: none!important; /* This is how it looks on desktop */
}
}

Thanks for your help! It works!

Problem solved.