Right-click on one of the selected objects to display the pop-up context menu for objects.
Alternative: Select the Objects entry in the Design menu.
3
Choose the desired operation ("Horizontally", "Vertically" or "Rotate") from the Rotate or Flip submenu.
Note: the Rotate operation will rotate the selected object(s) 90 degrees clockwise. When invoked on an already rotated object, this operation will rotate the object 90 degrees counter-clockwise (back to its original orientation, if the object has not been flipped). The equivalent of multiple clockwise rotations can be achieved using a combination of rotate and flip operations.