Amazon AppStream 2.0 adds dual monitor support for browser based streaming sessions
Today, Amazon AppStream 2.0 adds dual-monitor support for streaming sessions that are started on web browsers. For dual monitors, a maximum display resolution of 2560×1440 pixels per monitor is supported. If you want to use more than two monitors, or you require a display resolution that is greater than 2560×1440 pixels per monitor, you can download and use the AppStream 2.0 client for Windows.
Source:: Amazon AWS