Text view in SwiftUI doesn't show only with bigger font

In DoctorHomePage I have a grouped list and above the list I want to add a text view, but the text view doesn't show only if I change the font to a bigger one, but it is too big and I want it smaller. Here is my code:

import SwiftUI
import Combine

struct DoctorHomePage: View {

    @Binding var shouldPopToRootView : Bool

    @State private var curent: Int? = nil
    @State private var isActive: Bool = false
    @State private var id = 0
    let defaults = UserDefaults.standard
    let networkRequest = Network()
    @State var cancelable: AnyCancellable? = nil
    @State var localPatients : [Patients] = []

    var body: some View {
        NavigationView {
            VStack {
                NavigationLink(destination: ContentView(), tag: 1, selection: $curent) {
                    EmptyView()
                }
                Text("Welcome, doctor!") // this is the text that I want to add
                .font(.system(size: 30)).fontWeight(.ultraLight)
                .padding(.top, 50)
                // PATIENT LIST
                List(localPatients) { patient in
                    VStack(alignment: .leading) {
                        Text(patient.name)
                    }
                }.listStyle(GroupedListStyle())
                    .onAppear(perform: {
                    self.loadPatients()
                    connCode = self.defaults.integer(forKey: "doctorID")
                    self.id = connCode
                })

            }.edgesIgnoringSafeArea([.top, .bottom])
        }.navigationBarBackButtonHidden(true)
        .navigationBarHidden(true)
    }
}

Here are some screen shots to help you understand the problem:

The first image is with no text view.

The second image is with the font size of 60.

The third image is with the font size of 30.