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Colors are configurable for many things in the IDE but not the Error Marks. Consider adding a tab to the Fonts & COlors panel of the Options window to support configuration of Error Mark colors. Here are some current colors associated with different types of marks: (1)Thin black line with solid centered square --> Current line (2)dark grey --> Bookmark (3)pink --> Line breakpoint (4)orange --> Warning (e.g. Unused import) (5)red --> Error (e.g. ‘;’ expected, cannot find symbol, etc.)