# Unity Gameobject turned grayed

I accidently pressed some key combination which turned all the gameobjects in Unity engine gray and now I cannot restore them to the original form. Any suggestions? Below is the link of what I am talking about: https://ibb.co/izAVRo

Remove that f from the search bar.
It's trying to find gameobjects containing f letter, but none of them contains f in their name so all of them became gray.