IONIC 3 - When I call a screen through SideMenu, the back button on the Header does not appear. Does this have to be placed in app.components?

I'm starting to learn ionic 3 and creating a project, but when I enter a page through sidemenu the back button does not appear in the header ... Unlike if I enter the same screen by a button, in this case the back button.

this.pages = [
      { title: 'Home', component: HomePage },
      { title: 'Entrar', component: LoginPage },
    ];