The slider noidea_77 refers do does not change the font size but can be used to increase or decrease the zoom. Increasing the zoom will make the column letters and row numbers appear larger and thus easier to read. Another suggestion is to lower the screen resolution. However, the best solution may be the link below which gives instructons for how to change the font in Excel Column Headers: http
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/blog.contextures.com/archives/2012/05/01/change-font-in-excel-column-headers/