How to use multiple virtual monitors if host has a single monitor?

My host has a single physical monitor but I need to reproduce a bug in an application that requires two monitors, each having a different scaling factor.

VMWare provides documentation for cycling through multiple virtual machines but it requires the host to have multiple physical monitors.

How can one cycle through multiple virtual monitors with a single physical host monitor?

UPDATE: The guest is Windows 10. The host is either Windows or MacOS.

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