I have a problem with the width of the field of work

I have a problem with the width of the field of work. I cannot enlarge it when the laser window is running. If I turn it off, I can enlarge the field of work. The video is attached. System: MacBook Air + BigSur 11.2.3. I’ve had this problem for a few months now, but now I figured it out what was the reason, when I started turning off the windows and I found it …

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