Best schema design for Journal app storing notes as array or just object?

Question

I am building a Journal app for practice. Journal of a user contains many notes. Right now, I am creating a journal object for every user and storing notes as an array. Is this the right approach or should I just create a Note object for every note? The reason I created an object for all notes is that most of the time app loads all notes, so I thought this will be a good approach but I am facing some difficulties now(for eg. implementing search in notes, I cannot search for notes using MongoDB Atlas Search cause it returns the entire object i.e Journal if it matches a query.) Which is the right schema design for such an app? And where do I learn how to design schemas? My current Schema design is:

  {
  userid: {
    type: String,
    required: true,
  },
  notes: [
    {
      content: {
        type: String,
      },
      Date: {
        type: Date,
        default: Date.now,
      },
    },
  ],
}