We are building a very large open world game. The problem is, every time I drag a mesh from the content browser into the viewport, it appears very very far away from the location I actually need. I have to go through the headache of dragging it the needed location. Is there anyway to control the location where meshes initially appear in your viewport/map?
You have to drag the mesh ONTO something when you pull it into the viewport 
Also meshes keep their relative location to the 0,0,0 coordinate in the 3d modelling tool used to make them, so make sure when exporting a model from the 3d modelling tool it is located on the 0,0,0 coordinate…
There’s a distance based control for it in Project Settings. I don’t remember exactly which category, but it’s contextual so probably Rendering or something associated with meshes / content. It is for setting how far from the viewport camera it appears, so 200 would be 200 Unreal units, which is kinda close to the camera.