Earlier today someone requested a new option for exploring with fog of war. It ended up being very easy to pull off, so I have it done already! You can find details in the lighting system tutorial in the community forums: https://steamcommunity.com/app/3073720/discussions/0/756178376553825310/
Basically, there is a now a toggle (in the gear icon settings, not main setting on left) to adjust how areas outside the line of sight behave. Before they would just always be completely black. But now you can have them at half brightness if they've been explored.
The idea being players are moving around the map revealing areas but those areas aren't always in direct line of sight. Now you can tell which is which.
Features like these are perfect because they do not clutter the main UI and didn't take a whole lot of thought.
As usual, please leave a review if you haven't already.
PS: a user is having trouble launching after the switch to the C# version of the engine. Please report any problems in the bug report thread so I can see how pervasive they are.