The program's autostart has changed as well to a 'logon task trigger' which should 'reduce the switch delay after startup'. Options include setting these to 'light or 'dark' always, to have them change the theme based on the system, or to disable functionality (only Edge and Office).
There you may configure the desired light/dark mode behavior for applications, the system, the legacy version of Microsoft Edge, and Microsoft Office (new in this version). Another new feature that was not available in the initial 2018 version of the program is found under Apps in the interface.
