How to prevent ionic app from scaling up in iPhone 6(s)

I’m using my iPhone 6S for testing my ionic app compiled as native using Xcode.

I executed ionic prepare ios command to prepare the Xcode project.

When I installed the compiled app on my phone, I saw the app is auto-scaled to fit the screen size (i.e. not in the native scaling)

After some investigation, I found out that the issue can be solved by setting the Launch Screen File through the Xcode project setting.

But I’d like this to be done automatically by just running ionic prepare ios command. I expect the Launch Screen File should be set automatically by ionic (or Cordova?).

What should I do?