<UserButton/>component is used to render this familiar user button UI. It renders a clickable user avatar - when clicked, the full UI opens as a popup.
<UserButton/>automatically supports instant account switching, without the need of a full page reload. For more information, you can check out the Multi-session applications guide.
<UserButton/>component, all that's left is to render it inside your page. The default rendering is simple but powerful enough to cover most use-cases. The theme configuration (look and feel) that you've set up in your Clerk Dashboard will work out of the box.