Extrusion limited to particular axes

Hello

I’m currently learning extrusion modeling and am having a problem with extruding a vertex along the x axis. I’m using a headshot photo and created a single mirrored edge on the nose. From the side view, I used the extrusion method to follow the profile of the face on the z and y axis. From the front, I wanted to extrude off a vertex on the mirrored edge to shape the lips. The problem is that I can’t extrude along the x axis. It will only extrude along the z and y axes. How can I pull from the vertex and contour along the x axis?

Thanks much

Disable “Do Clipping” on your Mirror modifier panel.

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Of course! Makes sense. Thanks again.