File functions.php DIFETTOSO

The FUNCTIONS.PHP file has a code problem at this point, reported by my old but useful editor (see the code )

Every time I have to put in some code … I find it completely busted.
THIS ONLY HAPPENS WITH YOUR THEME … why?

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THIS ORIGINAL CODE = PROBLEM = INSTABILITY

<?php }
add_action(‘admin_notices’, ‘sydney_toolbox_fa_update_admin_notice’);

}

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SO THE FILE BECOMES STABLE AND DOES NOT CANCEL YOUR INTERNAL PHP CODES AND EVEN MY ADDITIONAL CODE CUSTOMIZATIONS

<?php }
add_action(‘admin_notices’, ‘sydney_toolbox_fa_update_admin_notice’);

}

/* MY CODE */
function example_theme_support() {remove_theme_support( ‘widgets-block-editor’ );} add_action( ‘after_setup_theme’, ‘example_theme_support’ );
/* MY CODE */
add_filter(‘use_block_editor_for_post’, ‘__return_false’);

/* MY ADDITIONAL END = SOLVE THE INSTABILITY OF THIS FILE FUNCTIONS OF THEME */
?>

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Have solutiions ? Thanks very much.

The page I need help with: [log in to see the link]