Boundary not working with inset faces command I'm working on Blender Guru's anvil tutorial.  At this point he insets a face and uses the boarder option to achieve the desired result.  I'm using v2.9 which no longer supports the B shortcut, but I can enable it in the new sub-menu for the command.  Nevertheless, nothing happens and the boarder piece remains, so I can't perform the extrude on a single entity; it comes out as two spikes.  What am I doing wrong?
If you turn off the Mirror, you will see that your anvil has a face inside look at the image, oce you delete that you will be able to use inset as expected