It appears the current Windows 10 Feature update 1809 doesn’t work nicely with the Windows Explorer for some. Many customers are complaining that both the textual content within the explorer is not white whereas others are reported that Windows Explorer remains to be in an excessive amount of white mode. Some of the customers have even reported that drop down dialog bins are virtually invisible. While this might be a bug within the OS, you possibly can attempt these ideas and see if it fixes this Dark Mode not working in Explorer downside for you.
Explorer Dark Mode not working
This is understood bug for which Microsoft is working to roll out a repair. It appears unexpectedly light-themed UI components (e.g., deal with bar) in File Explorer and unreadable textual content in context menus when utilizing darkish theme after the Windows 10 October 2018 Update (1809).
You might attempt the next:
1] Run System File Checker
We advocate you Run System File Checker in Safe Mode or Boot Time to restore doubtlessly corrupt explorer.exe and different system information.
2] Re-apply the Dark Mode
Next, perform Clean Boot and open Settings > Personalization > Themes
Choose the default theme in your PC and Apply to modify again to the default theme.
Now apply Dark Mode in Clean Boot State and see.
This will repair your downside.
The identical repair applies to the same downside the place when viewing a file within the Explorer window the icon labels are in black textual content and are virtually unattainable to learn towards the darkish background.
In case nothing is working for you, its greatest to modify again to the white mode, and wait for Microsoft to roll out an replace to repair this downside.
Are you going through related points? Let us know within the feedback?