Windows 10 has dark mode (Settings -> Personalisation -> Colours -> Choose your colour". However, it seems that Writer's save file dialogue uses blue colour for the checkboxes. First of all, using blue colour for checkboxes is weird on Windows, unless it is a clickable hyperlink, which it is not. And it is barely readable when using the Dark mode on a low brightness monitor.
Steps to Reproduce:
1. Turn on dark mode (Settings -> Personalisation -> Colours -> Choose your colour"
2. Save (Ctrl+S)
Checkbox text too dark to read.
Lighter colour when the system is using Dark mode.
User Profile Reset: No
OpenGL enabled: Yes
See the screenshot.
Created attachment 163751 [details]
Save, dark mode.
Created attachment 163877 [details]
KDE using Breeze Dark theme and style
Doesn't it pick up what your theme has defined? Works at least for me.
(In reply to Heiko Tietze from comment #2)
> Created attachment 163877 [details]
> KDE using Breeze Dark theme and style
> Doesn't it pick up what your theme has defined? Works at least for me.
That is Linux; this entry is for Windows. I tested it on Ubuntu Gnome (dark theme) and the checkbox texts were white as your KDE, but on Windows, it shows blue text on a dark background, making it difficult to read.
Invalid, no support for Windows Dark mode UWP themeing has been implemented.
See bug 118320
*** This bug has been marked as a duplicate of bug 118320 ***