fixed dropdown menu in top-nav layout

build/scss/_navs.scss

@@ -70,6 +70,10 @@
     padding-left: $navbar-nav-link-padding-x;
     padding-right: $navbar-nav-link-padding-x;
   }
+
+  .dropdown-menu {
+    position: absolute;
+  }
 }
 
 // Color variants

dist/css/adminlte.css

@@ -13254,6 +13254,10 @@ body.text-sm .control-sidebar {
   padding-right: 1rem;
 }
 
+.navbar-no-expand .dropdown-menu {
+  position: absolute;
+}
+
 .navbar-light {
   background-color: #f8f9fa;
 }