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I'm trying to create a roof on an existing building mesh. I thought I would do this by extruding this edge:

enter image description here

So I extruded it down the Z axis:

enter image description here

But I need it to go "inwards" a bit on the Y axis, like the edge of a roof does; like this:

enter image description here

So I tried changing the orientation of the extrude operation from Global to Normal:

enter image description here

But for some reason it moves the edge on the X axis:

enter image description here

I've verified that the normals are correct for the edge by turning on Display Split Normals in the Viewport Overlays menu. Here's a screenshot of that, from the Y/Z view:

enter image description here

How can I get it to extrude along the normal of the existing edge (so I guess along the Z and Y axis), without any movement on the X axis?

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