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:Disk Selection Screen/9.2/29/en

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  • Install bootable MBR: this option displays the FreeBSD boot manager[1] when the system boots. This is a simple and non-configurable boot manager which may or may not detect other operating systems installed on the computer. If you plan to only boot into PC-BSD® or to configure an alternate boot manager, you can uncheck this box.

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