When I open Unity Pro XL, why has the resolution changed resulting in the text being too small and unreadable?

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In most cases, this occurs when Unity Pro is opened on a PC using a high resolution monitor (> 1080p). In some cases the software retains the scaling of a previously used monitor and the only way to revert back is to connect that monitor back and change the scaling to suit the new monitor. For example if you are using a laptop and a second screen, the second screen could have been set to the main monitor instead of the laptop screen.