You can do
Win+R and then run then paste the command:
Code: Select all
filebot -script fn:properties --def net.filebot.theme=Darcula

The script just writes additional startup configuration. You can run the script within the GUI, but that's not advisable since it doesn't do anything to the currently running instance.

The
FileBot (platform) (i.e. filebot.platform.launcher.exe) shortcut uses the fail-safe configuration which disables system integration. This may include setting a specific theme. See
filebot.platform.launcher.l4j.ini for details. The
FileBot (i.e. filebot.launcher.exe) shortcut is the standard entry point for normal GUI users which will use the
AppsUseLightTheme registry setting to launch either in Light mode or Dark mode. For the sake of completeness, the
FileBot (console) (i.e. filebot.exe) shortcut is the standard entry point for CLI users.

What does the console output say when it doesn't work? Press
Win+R and then enter
filebot to run FileBot with console window so you can see the console output.
(NOTE: this is the same as launching via the FileBot (console) shortcut)