How to set default project and marketplace path

If running windows you can just use a symlink betwee locations. In a command prompt you can do

mklink /J “SOURCE” “DESTINATION”

so for me I used

mklink /J “c:\Users\Documents\Unreal Projects” “F:\UnrealEngine\Unreal Projects”

Make sure the source does not exist when you do this or you will error out so move the files out of the c:\ drive before you do the link