Great question — answering as the UphillTech team:
Dark mode was announced in version 7.0. The current latest version is 7.0.12 . If it doesn't work in the installed package, try instead to get the version from Download VirtualBox . You enter dark mode in Preferences > Interface and set the "Color Theme" to "Dark" : You need to close and reopen VirtualBox, which gives this result: To see a demonstration of setting this mode, see the video How to Switch Between Dark and Light Mode in Oracle VirtualBox
Full answer by harrymc: https://superuser.stackexchange.com/a/1819268 (CC BY-SA 4.0).
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