Hi @mary, if you are unable to duplicate this, please find attached and example where the issue is apparent.
Further to the zoom issue, there seems to be another issue where the geometry in PaperSpace (in Acad) has shifted slightly - this may be connected to printer settings and I hope you can duplicate it.
In the example, Layout 01 has printer set to PDF995, 02 is set to 'none' both with geometry in Layout space, and 03 is a new, default layout (A1) with one default detail with default 'none' printer setting.
When saved and opened in Autocad, the PSpace geometry and viewports have shifted in layouts 02 and 03. Looks like Autocad is adjusting margins or something and moving the paperspace objects to suit - could it be some not-so-obvious settings have become corrupted by taking in 3rd party Acad files to Rhino whose printer settings are not recognised? - shouldn't move the geometry though...
V5 Test - Layout to Acad.3dm(52.5 KB) V5 Test - Layout to Acad.dwg(15.2 KB)