Windows was a name first given to the Operating System on the analogy of the User Interface frame that each separate program had of its own. They could be easily resized and manipulated separately. This resizing feature, however, is sometimes not easy to manipulate for certain windows. When you click the ‘Save As’ option for some of your task in a program, it shows a fixed size window for the browsing option and the small default size can be not so much of a help when choosing from a long list of items.
If you want to resize the ‘Save As’ window, here is how you can easily do it and let the Windows (7 and above) save the size as a default for future displays:
Set ‘Save As’ window’s default size
Open a file in any program of your choosing, be it notepad, MS Word or Paint.
Click the ‘Save’ button or press Ctrl + S to get the ‘Save As’ window.
Resize the window by dragging it from the sides. Keep in mind that new size must show at least one …read more
Read more here:: Set Save as Window Default Size in Windows