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I have messed up the font size globally. I was playing with SetOptions and I think I have accidentally changed the font setting of the FronEnd setting globally as can be seen here.

enter image description here

I tried to uninstall Mathematical and instal it again but that did not help. how can I reset the font size to default.

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You may want to try this: I haven't tried it since I obviously don't want to lose my MMA settings. If it works, credits to @halirutan for pointing me to it in the chat. – seismatica Jul 16 '14 at 7:28
up vote 2 down vote accepted

Most likely you merely set to some $FrontEnd options unintentionally. If you can figure out what these options are you can reset them by clicking the X next to the field in the Option Inspector:

enter image description here

You can also select as text rather than by category to see a list of all the options that have been changed from the default (manually or otherwise).

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I was trying to understand your answer here:… and here :… but then every thing messed up. – Algohi Jul 16 '14 at 8:13
@Algohi Sorry. :-( Do I understand correctly that you were editing Style Sheets? – Mr.Wizard Jul 16 '14 at 8:20
I was trying to change the font globally because I had complicated graphic so that I do not need to manually style the fonts of everything in the graph. but then I released that I did some thing wrong which messed up the font globally. – Algohi Jul 16 '14 at 8:30
@Algohi Do you recall what exactly you were doing? Of course you don't know what went wrong, but it would help to know in what manner it happened. Were you editing style sheets? Using SetOptions? Something else? – Mr.Wizard Jul 16 '14 at 9:14
yes I was doing some thing one style. some thing like this SetOptions[Plot, PlotStyle -> Style[FontSize -> [20]]]; but I can't remember what exactly I did. – Algohi Jul 16 '14 at 19:02

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