Question about Movement

I am wondering about movement in Combat - so from Far range to Melee requires Agility Roll.
Does Melee to Far also requires Agility Roll?

Does Far to Close requires Agility Roll?
Does Far to Very Close requires Agility Roll?

How do you resolve movement inside Far range? Or movement from Melee to Very Far/Out Of Range?

I am trying to figure out how PCs can adjust their positioning in encounters and how I can make it more difficult/interesting.