dropdown restyle

css/aui-components/dropdown.scss

     }
 
 }
+.select2-results{
+    &::-webkit-scrollbar {
+        background-color: transparent;
+    }
+    &::-webkit-scrollbar-track {
+        background-color: transparent;
+    }
+    &::-webkit-scrollbar-track-piece {
+        background-color: transparent;
+    }
+    &::-webkit-scrollbar-thumb {
+        background-color: #3572b0;
+    }
+}
 .aui-select2-drop{
     z-index: 901;
 }

modules/UI/side_pannels/settings/SettingsMenu.js

     return options.join('');
 }
 
+/**
+ * Replace html select element to select2 custom dropdown
+ *
+ * @param {jQueryElement} $el native select element
+ * @param {function} onSelectedCb fired if item is selected
+ */
 function initSelect2($el, onSelectedCb) {
     $el.auiSelect2({
         minimumResultsForSearch: Infinity,