Users can rotate the currently selected page by using one of the rotation buttons on the top toolbar.
The following options are available:
Rotate left 90°
Rotates the image 90 degrees counter-clockwise.
Rotate right 90°
Rotates the image 90 degrees clockwise.
The Rotate 90° and the Rotate 180° options are also available by right-clicking on the document and navigating to the Rotation options in the appearing context menu: