fix: Show only the desired slideout menu.

bin/SlideOut.js

@@ -85,6 +85,8 @@ define('package/quiqqer/menu/bin/SlideOut', [
                 Elm.setStyle('z-index', 1);
             }
 
+            Elm.setStyle('display', 'none');
+
             var BodyWrapper = document.getElement('.slideout-panel');
 
             if (!BodyWrapper) {
@@ -231,6 +233,7 @@ define('package/quiqqer/menu/bin/SlideOut', [
             this.Slideout.on('beforeopen', function ()
             {
                 self.$onResize();
+                Elm.setStyle('display', '');
 
                 self.Slideout._padding = self.getAttribute('menu-width');
                 self.Slideout._translateTo = self.getAttribute('menu-width');

src/QUI/Menu/Menu.html

-<nav class="page-menu" data-qui="{$jsControl}" style="display: none">
+<nav class="page-menu" data-qui="{$jsControl}" style="display: none;">
 
     <div class="page-navigation">