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Open Tools > Options > Fonts and Colors. The selected item is "Whitespace" and the list of available things to set something on is scrolled to the bottom. Several times I have accidentally set the font for "Whitespace" thinking I was setting it for "Default". In previous versions, "Default" was the initial selection; probably a 1-line fix to correct this.
*** This issue has been marked as a duplicate of 165431 ***