[Page boundary on sheet layers]

I think I have found an answer. The page margins were at 0.42mm - maybe a default setting? I have now made a custom page size setting with margins set to zero and it seems to work well for me.

[Page boundary on sheet layers]

Can anyone tell me why the page boundary on the sheet layers are smaller than the page boundary on design layers. It's annoying when I have set my drawings to within what I shows as the boundary on the design layer and then I have to adjust the viewport on the sheet layer because the boundary is smaller and therefore clips off dimensons etc when printing. A3 is set on both sheet layer and design layer printer setup with one printer page chosen as page size. Is this just the way page boundaries are set up in Vectorworks?

I'm on iMac Leopard platform with Vectorworks 12.5.3.