With a notebook open, I try to change, just for that notebook, the Input and Output styles by doing Format \| Edit Stylesheet, then selecting from the scroll down Input and then go to Format \| Font, and then choose the font. I do the same for Local definition for style "Output" as well. Problem is, neither one 'takes'. The default style for both those remains in effect for both the existing cells and newly created cells of those types. When I do the same for Local definition for style "Text" it does take effect, for both existing and newly created text. What am I missing, besides great deal of experience changing styles of anything? -Brian

As has been stated at numerous WTCs, in forums, etc., it is an *extraordinarily* bad idea to change the style of Input and Output. This has been the case since at least Mathematica 6, if not earlier. I frequently edit the default style sheet (I hate Arial), but after noticing the unintended consequences of editing the styles of Input and Output, let alone StandardForm, I leave them alone. I have not tried Bruce Miller's suggestion, but apparently, this has undesirable side effects as well. I have not even thought about issues with non-roman typefaces.

Yes, it is unfortunate that the default input font (or maybe the default StandardForm) Courier New is *extraordinarily* *COUPLED*, apparently very deeply, into Mathematica code base. Not what I would call object oriented way of going about it. Enough with the dissing. As I wrote in my last reply to Bruce, I will just have to suck it up and change Input font to whatever looks better for presentation purposes by selecting the cell after it has been created and then Format.

Anyone from Wolfram care to assist in letting me know how to change Font for Input and Output forms via Format \| Edit Stylesheet? Only the size and form (bold, regular, italic, size, strikeout, etc) are changed, not the Font itself.

Format | Edit Stylesheet Has No Effect on Input or Ouput font