I'm new to XCode (12). My source code editor is showing line numbers, periods marking every space and carriage returns, all displayed in light grey. I can switch off the line numbers in Preferences > TextEditing > Display. Why am I seeing markings for periods and CRs though? How do you get rid of them?
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Choose Editor > Invisibles to toggle showing and hiding the invisible characters. You must select a source code file for the Invisibles menu item to appear in the Editor menu.

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