@smoon said:
'extend screen'
Since you have extend screen set, I assume you have more than one display connected. The second display is likely projector since you are mapping?
You need to change which display the stage is assigned to via the Stage Setup dialog. Once you set the stage to use the second display, you should have your output on the second display and still have access to Isadora on your main display. In this way you can open IzzyMap and make changes live.
Additionally, IzzyMap has the ability to publish parameters for external modification.. this allows live adjustment via any input you like.. for example you could use the color of a video input to change the rotation of a mapping. You can publish parameters by right-clicking points and selecting to publish them. Then when you close IzzyMap you can adjust these values externally. I don't think this is what you were asking about, but it might be of interest.