Layer hidden in Scene view, visible in game

Suddenly one of my layers is completely invisible in the Scene view and I am confused as to how it happened, I tried searching for the show/hide layer masks but I’m really not sure what I even clicked or pressed to hide it in the first place

Does anyone know where this button is to unhide as its a little inconvenient?

EDIT: the objects in the layer are not being hidden under my terrain or any other objects in the scene editor, theyre completely invisible

That was embarassing, turns out I didnt even realise there was a button on the top right labeled layers

[38120-how+did+i+not+see+this.png|38120]

I had the same problem a long time. Thank you

Totally saved my bacon. Thanks.