How to Hide Nexter Blocks Admin Menus

function plt_hide_the_plus_addons_for_block_editor_menus() {
	//Hide "Nexter Blocks".
	remove_menu_page('nexter_welcome_page');
	//Hide "Nexter Blocks → Dashboard".
	remove_submenu_page('nexter_welcome_page', 'nexter_welcome_page');
	//Hide "Nexter Blocks → Patterns".
	remove_submenu_page('nexter_welcome_page', 'http://127.0.0.1/wp-admin/edit.php?post_type=wp_block');
	//Hide "Nexter Blocks → Upgrade Now".
	remove_submenu_page('nexter_welcome_page', 'https://nexterwp.com/pricing/?utm_source=wpbackend&utm_medium=blocks&utm_campaign=nextersettings');
}

add_action('admin_menu', 'plt_hide_the_plus_addons_for_block_editor_menus', 102);
Where do I put this code?