Floating 2d Slice/Frame in Segment Editor

I am not sure how I added a floating 2d slice of the uCT scan while painting in Segment Editor. How do I remove it? See pictures for reference.

3d_slicer_help2
3d_slicer_help

It looks like you enabled the Show in 3D option for the Slice View by mistake.

https://www.slicer.org/wiki/Documentation/4.10/SlicerApplication/MainApplicationGUI#Slice_Viewers