There is a long-standing bug that I assume is related, where controls stop working if you click on an undocked window. I often undock a GNS view plus the ATC log on a second monitor. But if I begin making selections in the ATC menu, the controls stop responding until I click back on the screen running the main FS2020 view. This bug unfortunately doesn’t have a ready work-around, and somehow hasn’t gotten nearly as many votes.
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