change default name from "nuxt-app"

Hi, where do i change the default name from "nuxt-app" to something else? I tried to do it in nuxt.config.ts using

 app: {
    head: {
      title: 'My new site name',

 app: {
    head: {
      title: 'My new site name',

 app: {
    head: {
      title: 'My new site name',

 app: {
    head: {
      title: 'My new site name',