Sketchup only works on my laptop, but not on any of the 3 attached 43in monitors. I can drag the winow to any of the monitors, but non of the tools work on them… I stopped using Sketchup last September and it worked fine on all monitors at that time. Did Sketchup make some changes?
The problem will be related to how your monitors are connected and what the graphic drivers are doing.
Sketchup has done nothing to stop it working on multiple monitors, something on your system has changed.
Are you really using Sketchup 8?
I’m not a Mac user so I can’t help further.
I’m using Sketchup Pro 2020 Version 20.2.171
It works on multiple monitors. It’s likely some adjustments in your display settings.
Please correct your profile so we know what you have without having to ask.
The profile information tells us so much about what specific issues may be related to questions. Answer can vary so much depending on what combination of things you have.