Zooming In and Out - Zooming In and Out - OnBase - Mobile Access for iPhone - OnBase/Mobile-Access-for-iPhone/English/Foundation-22.1/Mobile-Access-for-iPhone/Usage/Working-With-Documents/Document-Viewer-Gestures/Zooming-In-and-Out - English - Foundation 22.1

You can quickly zoom in or out on a document by pinching your fingers together or apart across the screen.