This layout comes by default with a channels list, a track map, a histogram, a time/distance and a storyboard panel.
In the bottom part, the storyboard, you can doubleclick a lap to show or hide it, once a lap is shown, you can drag it to move the shown slice onto another lap.
The leftmost part shows on top a list of all the channels of the loaded runs, and, on bottom, a track map representation of loaded data.
The main part (dimensions wise) of the layout shows the histogram panel. By default, hitting the space bar, only this part will result in being shown, hitting the space bar again, the hidden parts will be promptly back.