[Offline Editor] Unable to access 2+ virtual screens

I'm running the v6.0.3 editor on my laptop with XP SP3, and despite having [2 virtual screens] selected in the [System Settings] menu, each time I enter the editor it only shows one screen. In the upper right corner, it also reads (Screen 1 / 1).

I only used the editor a couple times when it was on v6, and I seem to remember this being a problem on that version as well.

Is there a trick to getting both virtual screens to display?

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