It was something i already suggested in Construct 2 which sadly didn't come trough. But i still think it would be a big benefit for ajusting in the engine and also gameplay wise.
It would be really nice to add these two feautures (Image: Green square) to the "Line of Sight" behavior.
While creating an object with the LoS behavior, it would be a lot easier to ajust the LoS Range and Cone since you have the Visualization. Right now you have to guess and try over and over again to ajust the LoS as you would like to have it.
At the same time it would be a useful feauture for games itself.