Tips on Customizing GutenGeek Free Gutenberg Blocks for WordPress

How to Hide GTG Advanced Blocks Admin Menus

function plt_hide_gtg_advanced_blocks_menus() {
	//Hide "GutenGeek".
	remove_menu_page('gutengeek');
	//Hide "GutenGeek → Settings".
	remove_submenu_page('gutengeek', 'gutengeek');
	//Hide "GutenGeek → Custom Icons".
	remove_submenu_page('gutengeek', 'gutengeek-custom-icons');
	//Hide "GutenGeek → Custom Fonts".
	remove_submenu_page('gutengeek', 'gutengeek-custom-fonts');
	//Hide "GutenGeek → About".
	remove_submenu_page('gutengeek', 'gutengeek-about');
	//Hide "GutenGeek → Upgrade".
	remove_submenu_page('gutengeek', 'gutengeek-upgrade');
}

add_action('admin_menu', 'plt_hide_gtg_advanced_blocks_menus', 101);

Where do I put this code?

How to Hide the "Post Attributes" Meta Box

function plt_hide_gtg_advanced_blocks_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Post Attributes" meta box.
	remove_meta_box('pageparentdiv', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_gtg_advanced_blocks_metaboxes', 20);