Exactly the same as Select control.

The only difference is that the field will show a list of your pages. As a result, you don’t have to manually define the choices argument.

The default value for dropdown-pages controls can be a page ID (int).

Example: 'default' => 42, The returned value is the ID of the selected page.

Example

new \Kirki\Field\Dropdown_Pages(
	[
		'settings' => 'dropdown_pages_setting',
		'label'    => esc_html__( 'Dropdown Pages', 'kirki' ),
		'section'  => 'section_id',
		'default'  => 42,
		'priority' => 10,
	]
);