User-defined colours for dark mode override the automatic adaptive colour settings in the Simple adaptive colour mode. You can reset all user-defined dark-mode colours on a diagram page to their automatic defaults with a shortcut.

1. Press Ctrl+Shift+6 to open the Adaptive Colors dialog.
2. Deselect the Background or Labels colours if you want to keep their user-defined values.
3. Click Remove User-defined to reset the adaptive colours.

This ensures your diagram will have a uniform appearance for all shapes, connectors and labels in both dark and light modes.

Note: Adaptive colour and user-defined colours are saved per diagram page. To reset user-defined colours in a multi-page diagram, you will need to repeat this on every page of your multi-page diagram.

Learn more about adaptive colours and dark mode in draw.io