You can create 2 divs for the menu including the same menu
for example u can create one div has calss “logged-users-div” including menu.
and copy it with a class “not-logged-users-div” or any other classes for both
then we can do the following >
in your template page.
<?php
if ( is_user_logged_in() ) { ?>
<div class="logged-users-div">
<ul>
<li>element</li>
<li>element</li>
<li>element
<ul class="submenu">
<li>child element</li>
<li>child element</li>
<li>child element</li>
<li>child element</li>
</ul>
</li>
</ul>
</div>
<?php } else { ?>
<div class="not-logged-users-div">
<ul>
<li>element</li>
<li>element</li>
<li>element
<ul class="submenu">
<li>child element</li>
<li>child element</li>
<li>child element</li>
<li>child element</li>
</ul>
</li>
</ul>
</div>
<?php } ?>
and in your css , you can do this
.not-logged-users-div .submenu{
display:none;
}
or in custom window width
@media(max-width: 480px){
.not-logged-users-div .submenu{
display:none;
}
}