Shadow problem

Hello,
Let me be precise and to the point, In unity I created a interior bedroom scene, i added one directional light to the scene but it is interacting but it isn't seem like interacting.For example, when the camera perspective is far it isn't casting the shadow and when get closer to any of the objects in the scene it is casting a halo sized shadow. To better understand I've attached the screenshots of the scene. PFA and let me the solution for this....

Thank you,

Sincerely,
Santhosh.