Use the mouse scroll wheel to pan (hold) and zoom (scroll). Double-click the wheel to "Zoom Extents". Customization:
If your nanoCAD Portable 2021 fails to start or crashes, here is the fix for the top 3 problems: nanocad portable 2021
One advantage of nanoCAD Portable 2021 is its low footprint. On a typical USB 3.0 drive, you can expect: Use the mouse scroll wheel to pan (hold) and zoom (scroll)