, XFCE. AskUbuntu
The fix is as simple as selecting a different theme from the dialog xfce4-appearance-settingsavailable from the main menu in the "Settings" → "Appearance" section. In LXDE, the way to change topics is to use the command lxappearance, as its response indicates the status of codefx.

The topics "Roles" and "Industrial" have this problem. Many others, such as Grabird, Orion, and Shine, do not.
Here is the issue fixed with the Orion theme:

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