Hi hackermade,
You can go to the Dashboard > System > Site Template Styles > Your template > Layout settings > Edit header block and replace with the code:
<!-- HEADER BLOCK -->
<header id="t4-header-wrap" class="t4-header header-layout-1">
<div class="t4-header-inner">
<div class="container">
<div class="row no-gutters d-flex align-items-center flex-nowrap">
<div class="col-5 col-lg-3 t4-logo-header d-flex align-items-center">
<jdoc:include type="element" name="offcanvas-toggle" />
<jdoc:include type="element" name="logo" />
</div>
<div class="col-2 col-lg-7 t4-megamenu-wrap d-lg-flex justify-content-center col-xl-8">
<div class="t4-navbar">
<jdoc:include type="element" name="megamenu" />
</div>
</div>
<div class="col-5 col-lg-2 t4-header-right d-flex justify-content-end align-items-center">
<jdoc:include type="element" name="theme-toggle" />
<jdoc:include type="element" name="megamenu-toggle" />
<div class="head-search">
<jdoc:include type="modules" name="head-search" />
</div>
</div>
</div>
</div>
</div>
</header>
<!-- // HEADER BLOCK -->
Then add the following CSS code to the Tools > Custom CSS:
.navbar-brand .logo-img {
max-height: 80px;
}
Provide the admin account if you still this issue.