Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt."
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.

Translations:Display/9.2/2/en

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Control Panel → Display can be used to configure the system to run the display wizard the next time the system boots. This allows you to reconfigure your video driver and display settings.

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