In graphics.lua line 330 (see image below for reference):
distancFactor = {
Low = 0.5;
Medium = 0.7;
High = 1.0;
Ultra = 1.2;
Extreme = 1.5;
};
pick the one that you have chosen in your options, I presume you use Extreme setting so if you want to double the draw distance of cities etc you would set it to
distancFactor = {
Low = 0.5;
Medium = 0.7;
High = 1.0;
Ultra = 1.2;
Extreme = 3.0;
};
Beware this also affects the render distance of trees/forests, I generally put the slider to 50% when using this 3.0 setting as this causes strange issues with whole areas of forests/objects disappearing on the Caucasus map.