Indicates the reporting direction for a plot frame:

0 = Vertical,

1 = Horizontal.

For projects according to IEC standards, the reporting direction is typically "vertical"; for projects according to the NFPA standards, it is usually horizontal. For projects according to the GOST standard, the reporting direction is typically "vertical"; a column numbered from right to left and a row numbered from the bottom to top can also be set via the properties "Inverse column numbering" (ID 12035) and "Inverse row numbering" (ID 12036).

Reference

PlotFramePropertyList Class
PlotFramePropertyList Members