BlockNote Docs/React/Styling & Theming/UI ComponentsUI ComponentsBlockNote includes a number of UI Components (like menus and toolbars) that can be completely customized: Block Side Menu Formatting Toolbar Suggestion Menus Adding DOM AttributesBlockNote allows you to change how the editor UI looks. You can change the theme of the default UI, or override its CSS styles.Formatting ToolbarThe Formatting Toolbar appears whenever you highlight text in the editor.