Starting from version 17.1, the form title bar skinning feature is enabled by default. You can change this default behavior with the dedicated compatibility option (see Version Compatibility: Default Property Values), or with the WindowsFormsSettings.DisableFormSkins method.
If the title bar skinning feature is disabled, you can enable it by calling the EnableFormSkins or SkinManager.EnableFormSkinsIfNotVista method at runtime. Typically, these methods should be called at application startup.
It's possible to call the EnableFormSkins/SkinManager.EnableFormSkinsIfNotVista method later. In this instance, the DevExpress.LookAndFeel.LookAndFeelHelper.ForceDefaultLookAndFeelChanged method needs to be called after enabling skins. This forces the form's title bar to be repainted: