Updated to xenForo 2.1.x version.
Add the following code to the extra.less template without changing it.

CSS:

/* xFDestek.com - NavtabMenü xenForo 2.1.x ver Logo */
.p-nav-smallLogo img {max-height: 33px; max-width: 105px;}
.has-js .p-header {display: none;}
.has-js .p-sectionLinks {display: none;}
.has-js .p-sectionLinks {display: none;}
.p-header-logo {max-width: 100px;}
.has-js .p-nav-inner {min-height: 45px;}
.p-nav-smallLogo {display: block;}
.p-nav-list .p-navEl.is-selected .p-navEl-splitTrigger {display: inline;}
.p-nav-list .p-navEl-link.p-navEl-link--splitMenu { padding-right: 3.75px !important; }
.p-nav-list .p-navEl.is-selected { color: #FEFEFE; background: 0;}
/* xFDestek.com - NavtabMenü xenForo 2.1.x ver Logo */

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