У вашего броузера проблема в совместимости с HTML5
This video shows you a few tips on using the Editor quickly and effectively when working in a Game Jam.
Video Index:
0:20 Multiple Panels
1:47 Locking Details
3:54 Setting the Default Map
4:55 Editing the Default Game info
Further Reading and Watching:
Intro to UE4 Series:
https://www.youtube.com/watch?v=ApEtWpAialg