You only need to use the Blueprint, you can implement multi-viewport functionality for your runtime UE game.

It is very simple to use.

At the same time, you can also implement the Side-By-Side No Scale Stereo 3D effect.

Features: 

• Multi-viewports support.

• Side-By-Side No Scale Stereo 3D effect support.

• Only need to use Blueprints.

Code Modules: 

• MultiViews(Runtime)

Number of C++ Classes: 5

Supported Development Platforms: Win64, Win32, Mac, iOS, Android, TVOS, XboxOne, PS4, Mac, Linux

Supported Target Build Platforms: Windows, Mac

Documentation & Example Project: https://gitlab.com/UE4MarketplaceSubmission_Public/MultiViews4UE4_Public