Finder Window Will Not Remember Window Size Set

This seems to be a perennial problem. All my finder and OS tabs are opening at a small size. So I am having to resize EVERY new finder (or OS window), EVERY time.

Is there a way to force Finder to remember maximum screen? Or a set size? (not full screen where the menu bar disappears).

And isn't it about time Apple made 'fit window to screen' a setting, once and for all? MS Windows has had this since 1998, and I'm certain (25 years later) it's not beyond the tech minds at Apple. Thx