Fluent UI26 is set up to use dark grey in Light Mode and light grey in Dark Mode.
If you're using Dark Mode but want to use the Light Mode icons, you'll need to edit the icon set:
- Rename the .dis file to .zip.
- Extract it to a folder somewhere.
Then EITHER:
- Edit the XML file and delete the
<dark col="1" row="1" />
(for various row/col numbers) on each line.
OR:
- Edit the PNG files and swap the dark and light icons (top and bottom halves of the image).
Then zip the folder and rename it back to .dis. Make sure the XML and PNG files are directly inside the archive, not in a sub-directory of it.