How do I get login status after reloading a page that is not AuthGuarded?

I tried the sample.

I succeed login.
However isAuthenticated$.subscribe((isLogin) => ... return false after reload HomeComponent that is not use AuthGuard by app-routng.module.ts.

    this.auth.isAuthenticated$.subscribe(
      (isLogin) => {
       // return false after reloading a page

How do I get login status after reloading a page that is not AuthGuarded?