The alphabetical order that Minitab uses by default is based on your computer's region and language settings.
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If alphabetical or worksheet order are not what you want, you can specify a different value order. For example, if you create a bar chart of counts of t-shirts by size, by default, the bars are in alphabetical order (L, M, S, XL, XS). You can specify a custom value order for the text column so that the bars are displayed in the correct order (XS, S, M, L, XL).
The column in the worksheet looks the same—the value order is changed only in the output. The value order remains with the column until you change it again.