In Mathematica 11 it was very easy: Inspector options (Global Preferences) -> Global Options -> PrivateFrontEndOptions -> XDefaultApplicationFont. Then change for example for 14pt: "Bitstream Vera Sans-14". But in Mathematica 12 there is no XDefaultApplicationFont! How change font size now? System Linux Mint 18 (Ubuntu 16.04).

  • $\begingroup$ (Global Preferences) | Formatting Options | Font Options | Font Size $\endgroup$
    – Edmund
    Jun 8, 2019 at 23:37
  • $\begingroup$ @Edmund Does not work. Nothing changed at whole. $\endgroup$
    – nail
    Jun 8, 2019 at 23:43
  • $\begingroup$ Humm, that seems to only change the font size of the input lines in the documentation. The Magnification setting in the same location increases everything. You may need to close and reopen a workbook if it does not immediately magnify. $\endgroup$
    – Edmund
    Jun 9, 2019 at 0:06
  • $\begingroup$ @Edmund I do not need increse fonts of the input lines in notebook. I ask about increasing fonts in menu - File, Edit, Insert and so on. $\endgroup$
    – nail
    Jun 9, 2019 at 0:09


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