If two frames are displayed in the viewer, and each has a multiple image series in two different orientations, you can enable each series to show localizer lines. Then, when you select a frame, the other frame shows the intersection of the selected one.
If you change the tile mode of 1 x 1 (stack mode) to 2 x 3, you will see six localizer lines displayed on the image still rendered in stack mode. These lines correspond to all six images displayed in the tile frame. As you scroll through the tile frame, the localizer lines change to reflect the six displayed images.