Too late MS, I have already deleted your partition…
And recreated the partition table which you so kindly made with badly aligned sectors.

A few minutes after posting this, I realised that it actually showed the entry that you selected in the above view.

So, it was a HTML browser widget and it was white because everything that shows HTML has a FFFFFFacepalm background by default.

I need to fix that background colour. Or I will end up keeping that thing hidden forever.

Ok, I recalled wrong, it was unspecified

Yeah. I once had to do stuff to code that had bit-fields like that and after a while, realised (by means of StackOverflow) that that part is UB and I had to go with bitwise operations instead.