Found it! Was kind of obvious, but I didn't see it... SO much better now.
And no, I'm not hacking my laptop that way. Not that confident, yet. ... ... Anyway, I was too curious, wanted to see what happens. It opened a PowerQuery Editor in Excel. Took a while to load, so I guess it's some kind of wicked witchery. Did it on Desktop, but it just lowered the brightness of the screen - I already knew that one. Windows doesn't know a VBA Editor, at least not for now. And I'm off not. It's getting late. GF finished her painting, time for a beer on the rooftop. Still can't believe you called my plotting "rather good". Going to mark this day in my calendar 😜
With black cells and white text in excel you have officially reached a good apprenticeship level!
Congratulations! :)