Cannot change font style

Hi,

My Keil version is uv4(9.0.3) and mdk-4.20. I want to change the keywords font style to bold text. But the style menu is diable in the 'Colors and Fonts' tab in dialog 'Configuration'. Just as the picture showing!

upload.ouliu.net/.../89bd12c6461175c9507dc4a884289c21.png

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