Night mode in the text areas of live?

I clicked something and got night mode?  How did I do that?  How and where is the option located?

Please and thanks.

No, I was aware of focus mode.  I'll post a screen grab.

I logged in today and that side was white like it always was and I clumsily clicked-dragged something and it went dark mode.  I don't know if that was a coincidence so started looking around for the menu option to turn back to white mode...and I can't find it.

So am I hallucinating that it was white all this time?  

Click on the gear symbol. The dark mode switch is in the board settings.

Go to theme.There is an option for dark mode on upper right side.You can switch it off if you don't want dark mode.

Ah.  Thank you.  My gaze missed the setting.  Perturbing how I managed to switch it.  Thank you again.

Oh chungle and your shenanigans.

I am a shenanigator - ish.  Lol.

Ah! Discovered what I clicked! Lol, must have brushed by and click spasmed and boom, dark mode from 'no where'.