Use selection tool to select part content of the canvas first.
Drag on the selection.
Also, you can use the move btns to move the selection pixel by pixel.
Drag on the resize handle to zoom the selected content.
Drag on the rotate handle to rotate the selected content.
Drag on the skew handle to skew the selected content.
The real ISO angle is 26.56505117707799(atan 1/2), but skew use Integer degree. Neight 26 or 27 will cause the non-perfect isometric line problem.
The degree value show above the handle.
For flip/rotate90/copy/paste, see Editing.