It would be cool to have Parallels sense when macOS Dark Mode is enabled and automatically switch Windows to its native "Dark Apps Mode" I think going through the registry is the easiest way to automate this (I believe it is only one key to switch the entire thing on/off), but I could be wrong. Thanks for the amazing app
Parallels Desktop for Mac does not have a built-in feature that automatically switches Windows to a dark mode when macOS Dark Mode is enabled. You would likely need to use a third-party tool or script to achieve this functionality, as it would require monitoring the macOS system for Dark Mode changes and then triggering changes in the Windows environment accordingly. The Windows registry may be involved, but it would likely be just one part of a larger solution.