File > Options > Graphics > Frame Elements > Reference Lines
Specify the default settings for reference lines on graphs. The changes you make to the defaults remain until you change them again, even after you exit Minitab.
File > Options > Graphics > Frame Elements > Reference Lines > Attributes
Specify the default type, color, and size (thickness) of reference lines on graphs.
File > Options > Graphics > Frame Elements > Reference Lines > Font
Specify the default settings for the name, style, size, and color of the font of labels on reference lines.
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