This tabsheet mainly defines the behavior of the mouse operation. Left clicking and dragging can result in rotating, moving or rescaling the object. We remark that the dragging with the right function key results in a translation and that the mouse wheel can be used to zoom in or out. Furthermore, some preset viewpoints are defined (side and top views), and a reset button to go to the initial position. It is possible to reset all viewpoint settings. Moreover, the size of the viewing window can be changed. This is useful if one wants to export images with specific dimensions. The dimension of the window is visible. Remark that the arrow keys on the keyboard can be used to fine tune the dimensions.