Fail to display the editor theme

There's something wrong with my editor theme.
Whatever theme I choose, the codes just display only one color but not like the colorful code as the theme. For example, I choose the theme "Tomorrow", but the color of my code is different from the preview of the "Tomorrow" theme. I hope that different functions can have different colors :frowning:
I'm a new user of the community so I can't upload screenshot, sorry for that (:з」∠)

This is the screenshot of my RStudio, I have already choose the theme "Tomorrow".
My system is Windows 10 and the version of RStudio is 1.3.1093.

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