设置UE游戏启动时为窗口模式，而不是全屏
在工程config目录下新建文件DefaultGameUserSettings.ini，并输入以下内容
[/Script/Engine.GameUserSettings]
bUseVSync=False
ResolutionSizeX=800
ResolutionSizeY=600
LastUserConfirmedResolutionSizeX=800
LastUserConfirmedResolutionSizeY=600
WindowPosX=-1
WindowPosY=-1
FullscreenMode=2
LastConfirmedFullscreenMode=2
Version=5重新打包游戏即可