We are currently looking into ways to facilitate hub customization, which could include colors. This isn't Dark Mode, but perhaps it will be a first step in that direction.
As it is not our top priority right now, I will change the status to "Open - Not Planned" but I will update the status when/if that changes.
Certainly we've learned enough by now how bad staring at a white background all day is for us. I'm at the point where I need to choose software that I can actually use all day. Call me when there's a dark mode...
A Qlik-native dark mode option for the script and formula editors would be great; many organizations prohibit the use of chrome extensions that would be the temporary solution.