I have been regularly backing up (Export Settings) as I've gone along, building dozens of Wallpaper Profiles and Monitor Profiles. It ends up that not only have the backups not been saving settings (e.g. Dark Mode), but have also not been backing up Wallpaper Profiles and Monitor Profiles.

Is all my work totally lost? Should I have been manually backing up this directory?: C:\Program Files\DisplayFusion\

Nevermind; this worked: https://www.displayfusion.com/Discussions/View/importexport-displayfusion-settings/?ID=401c2a80-fb6e-4980-9173-4cdfab832f3f

This fixed it: https://www.displayfusion.com/Discussions/View/importexport-displayfusion-settings/?ID=401c2a80-fb6e-4980-9173-4cdfab832f3f