Hi ribo,
In the header-1 block, the template using the order-xxl-1, order-xxl-2, and order-xxl-3 class to order the position for the sections, you can find the class in the following code to change it.
Go to the Backend > System > Site template styles > JA Ego - template > Layout settings > Header.
<!-- HEADER BLOCK -->
<header class="header-block header-block-1">
<div class="header-wrap d-flex align-items-center justify-content-between collapse-static row t4-header-height">
<div class="t4-logo-wrap d-flex align-items-center justify-content-xxl-center col-4 col-md-1 col-xxl-2 order-xxl-2">
<jdoc:include type="element" name="logo" data-home="index.php" />
</div>
<div class="nav-align-left col-2 col-md-7 col-xxl-5 order-xxl-1">
<jdoc:include type="element" name="megamenu" />
</div>
<div class="t4-header-r d-flex align-items-center justify-content-end col-6 col-md-4 col-xxl-5 order-xxl-3">
<jdoc:include type="modules" name="header-r" style="raw" />
<jdoc:include type="element" name="megamenu-toggle" />
<jdoc:include type="element" name="offcanvas-toggle" />
</div>
</div>
</header>
<!-- // HEADER BLOCK -->
