Example of how to include wide align support for Gutenberg blocks in your WordPress Theme.

wide-align-block-support.php

<?php

// Wrapper function for add_theme_support setup
function mytheme_setup_theme_supported_features() {

  // Add theme support for wide align blocks
  add_theme_support( 'align-wide' );

}
// Hook wrapper function into WP once theme is ready
add_action( 'after_setup_theme', 'mytheme_setup_theme_supported_features' );