So I found that the only way to enable Dark Mode for Box in a Chrome Browser is to go into Chrome Settings, search for “dark”, and change it to “Enabled”.
Interesting enough, mine was set to “Default” which reads its setting from the OS. As my OS is in dark mode, most websites could tell that I wanted dark mode, but not Box. I think the Box devs may be checking for this wrong. In fact I’m not even sure how they are doing this. There is a CSS check that does this for dark OS’s with chrome at “Default” and/or “Enabled”:
@media (prefers-color-scheme: dark) { /* Styles for dark mode */ }
I was surprised that nobody has asked about this. Anyway, hope my tip above helps someone get dark mode working, and I hope this message can get to the Box devs.