I may be misinformed in thinking that the way this is done is that Windows 10 gives the same "Save As" -dialogue to all the programs. In this closely related question the answerers deal with Windows 7 and specific Microsoft software. I know, I should just learn to check, but often forget, because this save as -operation is just a small step in my overall work flow. Over time I have misplaced several files as a consequence of this. I may be using my laptop in some archaic way, but with nearly everything else configurable, why isn't this? Or is it? AFAICT the default folder displayed in that pane is chosen according to the previous "Save As" operation, when, in my humble opinion, the folder of the previous "Open" operation would be a more logical choice. Instead, the contents of the folder only relevant to some earlier operation are displayed in that pane.
I find it very annoying that the folder X is not the default one opened in that pane. Then I modify the file, and want to save another copy of it with the "Save As"-function from within that program (or in the case of Mathematica I want to some output within that program). So I open X, and click the icon of the file. I have a file in folder X associated with program Y. This behavior of windows 10 has been getting on my nerves. Is it possible to configure the "Save As"-dialogue in Windows 10 in such a way that the default folder (=the folder whose contents are displayed in the pane) would be "the current folder"? That is, the folder where I started the program from? Caveat: A user who knew DOS inside out, but has lost touch since.