To zoom in and out in a Cyclorama, scroll with your mouse or use the scroll functionality on your touchpad. Alternatively, you can use the plus and minus buttons in the menu bar in the bottom of the map viewer.
If the menu bar is not visible, you can turn it on by pressing the menu toggle in the bottom-left corner of the Cyclorama viewer.
Like zooming, panning works similar as in map applications: drag the Cyclorama by keeping your mouse button or touchpad button down while moving the Cyclorama in the desired direction. If you have a touchscreen you can also use your fingers to drag the Cyclorama around.