Decided to try to learn Blender, so started modelling new shelving using it. Early on I had beveled a corner (not with a modifier) where the shelving goes from one wall to another. We have since decided we would prefer it sharp. I understand that the modifier would have been the better choice, but as I beveled with relatively few segments, I thought that it would be a good exercise to learn how one might manually remove the additional segments...so far though, no luck. Can anyone suggest a course of editing to convert the two sections shown to 90 degree corners?