Here are the options, straight out of the menu, verbatim:
Options
View: Full, Limited to the chief of army
Visibility: Unconditional, Marker?, Conditional without delay, Conditional with delay
Friendly visibility: Unconditional, Conditional
Orders: Immediate, Delayed
Delay of orders: Historical, Limited
Interception of orders: Disabled, Enabled
Orders in 3D view: Whole map, Local zone
Information: Precise, Vague
Loss of corps commander: Enabled, Disabled
Galvanised units: Enabled, Disabled
Ammunition: Historical (limited), Unlimited
Mode: Conscript, Regular, Grognard
If you're not clear on what these mean, check the manual.
Some of these are just fog of war. Others are difficulty settings. Additional settings may be added in the future, including settings that aren't related to fog of war.
Now... since it's not JUST fog of war, what do you want to do?
Hook