By object:

The Section plane for you object gets added at the origin of your active object.

By moving or rotating  your section plane you set your section view.

If you want to change the color of you section view, just select the Add object section button again and pick another color.

By selecting the RESTORE OBJECT button, the section plane is deleted and the object returns to its original shape and material/texture.

For all your objects:

You just select any object and hit the Add scene section button.  You can choose your section view color and select ok.

The Section plane for your scene gets added at the 3D cursor.

By moving or rotating  your section plane you set your section view.

If you want to change the color of you section view, just select the Add scene section button again and pick another color.

By selecting the RESTORE ALL button, the section plane is deleted and the scene restores to how it was before with the original materials/textures.