Click on the image and push the left mouse for moving the image. If you move the mouse pointer now horizontally to the left or right, the image is moved into this direction
Choose the plus symbol below the image for zooming. Make now a window in the image to zoom this detail, or just click on the image
Choose the minus symbol and click on the image for reducing in size
Choose this symbol for having the original version of the image
rotation
stop rotation
changing rotaion
Use the tool with the hand symbol (only for 2D images, not for panoramas) to move the detail. Click on the image and move the mouse while pushing the left mouse
You can see more details of 2D images with the magnifying glass (only for 2D images, not for panoramas).