Use d.zoom for zooming and panning in the currently selected monitor. d.zoom without any command line options allows you to zoom in by selecting a zooming frame (left mouse button) or to zoom out (middle mouse button). If you launch d.zoom -f, you get the option between zooming (left mouse button) or panning (middle mouse button). If you only want to pan, try d.pan.
Both d.zoom and d.pan change your current region settings. They are, in that sense, an interactive version of g.region, so be aware that any command using the current region settings will be affected by the use of d.zoom or d.pan.