FULL" mode takes full advantage of the high magnification ratio of the FUJIFILM X-T1's viewfinder to give an unrivalled view of the scene. "NORMAL" provides an optimum view, including shooting settings and "DUAL" is specially designed for manual focusing with a clever split view.
In the "NORMAL" and "FULL" modes, the view automatically rotates for a vertical orientation when the camera is held vertically.