function plt_hide_omnisend_menus() {
//Hide the "Omnisend Email Marketing" menu.
remove_menu_page('omnisend');
//Hide the "Omnisend Email Marketing → Home" menu.
remove_submenu_page('omnisend', 'omnisend');
//Hide the "Omnisend Email Marketing → Add-Ons" menu.
remove_submenu_page('omnisend', 'omnisend-app-market');
}
add_action('admin_menu', 'plt_hide_omnisend_menus', 11);