If we want to use multiple select dropdowns on one page, we need to attach click listener to all .custom-select-wrapper elements and close all dropdowns if user clicks out of a dropdown. Step 2: Change the CSS of the dropdown-toggle to display:none.This will disappear the solid dropdown logo from the button. Bootstrap handles the JavaScript behind the scenes. Somewhere that we see these a lot is inside of headers or navigation areas on websites. 3 new items. The button shows the currently selected item as well as an arrow that opens a menu for selecting another item. This is maybe even clearer with the code -element. From its name, you can understand what it means. Advanced Dropdown Classes Additional classes can be added to your dropdown to change its appearance. 1 Answer. Dropdowns can be triggered from or