If your simply dragging the editor to another monitor. And the other monitor is of a different resolution. Or, has a different zoom level applied to the screen. Camtasia needs to be re-started on the other screen.
Heres how it works for me. I have Camtasia pinned to the taskbar. If I launch Camtasia from the taskbar of my secondary monitor. It will relaunch on that monitor, scaling is corrected.