iOS app constrained to dimensions of 4S screen

Question

I'm working on a React Native app and for some reason it started only rendering in iPhone 4S dimensions. The issue started happening when I upgraded a bunch of packages and messed with the Info.plist, project.pbxproj, and *.xcscheme a bit (too much it seems).

Here's a screenshot on an iPhone 6:

When I run it on a 4S it looks normal.

Any ideas?

Answer 1

As someone mentioned this happens when Launch Screen File is empty. Verify in XCode under the 'General' section that Launch Screen File is not empty: