Fog of war

How can fog of war be removed? :help:

Type 'toggle_fow' in the console (~).

Sorry to be so dumb, but where is that? And how do I do that? Is it a txt file? Which file is it? What do I write? The same true/false as in Rome?

It's the apostrophe key for M2 - I believe. Hit the apostrophe key and a prompt should come up saying Welcome to MedievalShell, type toggle_fow in there.

I'll try that.
Thank you!!

In Germany it's the ö key :)