[[pdoMenu?
&parents=`7`
&level=`2`
&outerClass=`nav justify-content-end text-uppercase menu-top`
&tpl=`@INLINE <li[[+classes]]><a class="nav-link text-dark" href="[[+link]]" [[+attributes]] title="[[+menutitle]]">[[+menutitle]]</a>[[+wrapper]]</li>`
&rowClass=`nav-item text-uppercase`
&parentClass=`dropdown`
&tplParentRow=`@INLINE <li[[+classes]]><a href="[[+link]]" [[+attributes]] class="nav-link dropdown-toggle text-dark">[[+menutitle]]</a><ul class="dropdown-menu">[[+wrapper]]</ul></li>`
&tplInner=`@INLINE [[+wrapper]]`
]]
в общем атрибут data-toggle="dropdown"
не нужен [[pdoMenu?&firstClass=``&lastClass=`` &parents=`0` &level=`1`]]