WP_Widget_Block::set_is_wide_widget_in_customizer( bool $is_wide, string $widget_id )

Source

File: wp-includes/widgets/class-wp-widget-block.php

public function set_is_wide_widget_in_customizer( $is_wide, $widget_id ) {
		if ( strpos( $widget_id, 'block-' ) === 0 ) {
			return false;
		}

		return $is_wide;
	}