3D Manipulator problem

Sorry in advance if I create any unnecessary confusion,

So, you know when you grab an object via the 3D manipulator? On any axis, you get that thin blue line that directs where your object is gonna go. I must’ve done something, because now it’s visible through everything.

I want to hover an object slightly over the ground, but it’s causing a slight inconvenience.
Where throughout blender, can I de-activate this? It’s driving me nuts.