Disable Inspector Tabs

add_filter( 'block_editor_settings_all', function ( $settings ) {

	if ( ! isset( $settings['blockInspectorTabs'] ) ) {

		$settings['blockInspectorTabs'] = array();

	}

	$settings['blockInspectorTabs'] = array_merge(

		$settings[ 'blockInspectorTabs' ],

		array( 

			'default'     => false, // Disables for all blocks.

		),

	);

	return $settings;

} );