I personally hate the embedded board array feature. It isn't quite what I want it to be yet. It would be amazing if Altium had another "Mode" such as 3D and Board Layout to do panelization. The workflow just feels wrong when you have to create a new document to generate panelized data, not to mention the fact that I could never decide where to put the fabrication drawing. Do you put it on the single up board, or the panelized board array. This is why I will continue to have mechanical layers for format/routing and panelization. Currently it is just easier for me to set the grid to the panel step and copy the board outline a few times. Draw your panel/scoring/routing, and you're done!