Edit C:\Program Files\PLSQL Developer\Preferences\Large Fonts.ini
[Fonts] MainFontName=Segoe UI MainFontCharset=1 MainFontSize=11 BrowserFontName=Segoe UI BrowserFontCharset=1 BrowserFontSize=10 BrowserFontBold=False BrowserFontItalic=False GridFontName=Segoe UI GridFontCharset=1 GridFontSize=11 GridFontBold=False GridFontItalic=False CopyGridWithStyle=4230400 EditorFontName=Courier New EditorFontCharset=1 EditorFontSize=12 EditorFontBold=False EditorFontItalic=False
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