Just a moment...
Occasionally you'll find menu items that are grayed out - usually menu items like VFR, or PRE-REC, or VIDEO OUT OSD. And it can be frustrating to see those disabled menu items and not know why they're disabled, or how you can re-enable them. I put a section in the book specifically addressing why menu items get disabled, which ones get disabled, and what you'd have to change to re-enable them. Look up the Disabled Menu Items article.
Also, there are some functions that are only possible when the camera is in HD mode, and are disabled when in UHD or 4K (examples include the 5-axis image stabilizer, or variable frame rates). Again, see the "Disabled Menu Items" article for more information.