To zoom in and out: Switch to camera zoom mode (located in the camera function’s top panel). You can then use your mouse’s scroll toggle, use your laptop’s trackpad (move two fingers up and down), or the + and - keys on your keyboard to zoom in and out. To move/pan camera: Switch to camera pan mode (located in the camera function’s top panel). You can then press down scroll on your mouse and move the mouse (if available) or simply use the top/bottom/left/right keys on your keyboard to pan. For a complete overview see understanding the camera in computer graphics.