Vertical scrolling mode (also known as continuous mode) can be enabled by setting the page presentation mode to either PDFViewCtrl.PagePresentationModes.SingleCont / pdftron.PDF.PagePresentationModes.e_single_continuous, PDFViewCtrl.PagePresentationModes.FacingCont / pdftron.PDF.PagePresentationModes.e_facing_continuous, or PDFViewCtrl.PagePresentationModes.FacingCoverCont / pdftron.PDF.PagePresentationModes.e_facing_continuous_cover.
Here's what setting the page presentation mode to vertical scrolling looks like:
Horizontal scrolling mode (also known as non-continuous mode) can be enabled by setting the page presentation mode to either PDFViewCtrl.PagePresentationModes.Single / pdftron.PDF.PagePresentationModes.e_single_page, PDFViewCtrl.PagePresentationModes.Facing / pdftron.PDF.PagePresentationModes.e_facing, or PDFViewCtrl.PagePresentationModes.FacingCover / pdftron.PDF.PagePresentationModes.e_facing_cover.
Here's what setting the page presentation mode to horizontal scrolling looks like: