readingOrderMode

Set text extraction mode to "reading order".
[read/write property] readingOrderMode([out, retval] VARIANT_BOOL *readingOrder) readingOrderMode([in] VARIANT_BOOL readingOrder)
Setting this property to true sets the text extraction mode to "reading order". Each page will be processed to "undo" physical layout (columns, hyphenation, etc.), generating text in reading order.

Only one mode, from readingOrderMode, physicalLayoutMode, tableLayoutMode, linePrinterMode, or rawMode can be selected.

VB6:
pdf.readingOrderMode = True
physicalLayoutMode
tableLayoutMode
linePrinterMode
rawMode