Block tunes are options that apply to a single block of any type. Open them with the settings button next to a block.

Tune	Available for	Description
Alignment	Paragraph, Header	Aligns the text left, center, right or justified. Also available as inline tool in the toolbar.
CSS Class	All blocks	Wraps the block in a div with one or more custom CSS classes, separated by spaces.
Duplicate	All blocks	Inserts a copy of the block directly below it.
Hidden	All blocks	Hides the block on the published page. It stays visible and editable in the editor.

Hidden Blocks

Use Hidden for notes to other editors or for content that is not ready yet. Hidden blocks are skipped when the page is rendered, so they do not appear in the HTML.

CSS Classes

Custom classes are styled by the theme or by the custom CSS under Global Settings > Appearance > Custom Code. Extensions can register additional tunes, see Extension Development.