Thank you so much - incredibly generous of you! And super helpful.So, I made two photos with the requested apps on 3 columns.
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And one more thing... At least when working with mail + documents (except excel files) I use at least 4 or even 5 columns.
Looking at your photos and comparing in my minds eye as best I can to my 5k/2k widescreen LG, which I have set to 3840x1620 HiDPI and use with 3 columns of apps, I concur that I'd wind up with 4 or 5 columns too. 4 might make more sense with the workspace though of course then nothing is dead center.
I may give this monitor a go, but I'd want to get it from somewhere like BestBuy and get their extended warranty so I could easily walk in and swap for any defects. I know that if you look hard enough at any product you'll find reports online of QC issues, but, this monitor in particular seems troublesome in that regard.
Anyway thanks again!