When I put the windows settings on duplicate displays, I expect the game to be displayed on both displays. However, the game is only shown on my TV, while the monitor becomes black with only the ZDL window displayed. Workaround: alt-enter to disable full-screen and alt-enter again to get it back.
When I change my main screen to the TV, the game is still only displayed on the monitor in full-screen mode. I haven't found a workaround for this.
Display adapter: Radeon RX 480
Monitors: Samsung S23B300 (connected by DVI) and an LCD TV (connected by HDMI). Both with native resolution 1920x1080.
OS: Windows 10 Home