How to Hide Nexter Extension Admin Menus

function plt_hide_nexter_extension_menus() {
	//Hide "Nexter".
	remove_menu_page('nexter_welcome');
	//Hide "Nexter → Dashboard".
	remove_submenu_page('nexter_welcome', 'nexter_welcome');
	//Hide "Nexter → Templates".
	remove_submenu_page('nexter_welcome', 'nexter_welcome#/templates');
	//Hide "Nexter → Blocks".
	remove_submenu_page('nexter_welcome', 'nexter_welcome#/blocks');
	//Hide "Nexter → Theme Builder".
	remove_submenu_page('nexter_welcome', 'nxt_builder');
	//Hide "Nexter → Code Snippets".
	remove_submenu_page('nexter_welcome', 'nxt_code_snippets');
	//Hide "Nexter → Extensions".
	remove_submenu_page('nexter_welcome', 'nexter_welcome#/utilities');
	//Hide "Nexter → Theme Customizer".
	remove_submenu_page('nexter_welcome', 'nexter_welcome#/theme_customizer');
	//Hide "Nexter → Get Pro Nexter".
	remove_submenu_page('nexter_welcome', 'https://nexterwp.com/pricing/?utm_source=wpbackend&utm_medium=blocks&utm_campaign=nextersettings');
}

add_action('admin_menu', 'plt_hide_nexter_extension_menus', 11);

Where do I put this code?