Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 66)

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Menu Operations and Settings
Dimmed Menu Items
Example: Highlight tone priority
Dimmed menu items cannot be set. The
menu item is dimmed if another function
setting is overriding it.
You can see the overriding function by
selecting the dimmed menu item and
pressing <
0
>.
If you cancel the overriding function’s
setting, the dimmed menu item will become
settable.
o You may not be able to see the overriding function for certain dimmed menu
items.
o With [ 5 : Clear all camera settings] , you can reset the menu functions to the
default settings ( = 547).