Display shrinks in games room when build and run with OpenGLCore, OpenGLES3, OpenGLES2

Steps to Repro:
1. Create a new project
2. File >build settings >
3. Switch to the Facebook platform and set the target platform to Gamesroom
4. Build and Run

Actual Result:
1. Build opens with facebook games room application
2. The display is shrunk in the bottom right corner

Note:
1. Build crashes on running when it's built with DirectX 12 API

Expected Result:
1. The game should run in the full window

Workaround:
1. Resizing the window fixes the issue

Environment:
Only on Windows

Occurring with:
2018.3.0a11, 2018.2.0f1, 2018.1.6f1, 2018.1.0a1

Working with:
2017.4.8f1