Page specific units and scale in Draw

Trying to set Units for a single page of a Draw document to millimeters.
Seems both units and scale are Global to all of Draw.
Yet I use the same program, possibly same file, to store drawings of both a 100 SqFt room and a 4 acre parcel, and quite possibly want to work with millimeters on one page and feet on an other. Why aren’t these properties of an individual page?

The units and scale is saved within the file so you can use Draw for different projects. I have opened two existing files, one uses mm at a a scale of 10:1 and another uses cm at a scale of 1:10

The scale and units belong to the file so you cannot have different scale or units for different pages within the same file.

Since LibreOffice 7.2 the scale is accessible from the status bar in Draw, see ReleaseNotes/7.2 - The Document Foundation Wiki

Thanks for the info.