DWGUNITS reframed every viewport by the conversion factor, on the
reasoning that a viewport's framing is measured in model units and has to
follow them. That holds for a window onto the model; it does not hold for
a layout's sheet viewport, whose view is the paper itself, in paper
units. Scaling it left the sheet the size it was while the view of it
moved by a thousand.
Only a paper-space viewport can be a sheet — the model-space scale
reached everything else, and what it reached frames the model by
definition. Among the rest, the layout names its sheet outright, and a
file arriving without that link still gives itself away by sitting at the
paper origin, where only the sheet sits.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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