On the lower-left side of the window, you will see a list of all scientific instruments available.
On the right side you will find all exposures of each instrument:
The exposures are aligned as bars with some text information. The size of the bar is related to the duration of the exposure, and the position of each bar depend on the instrument it belongs to and the start time of the exposure.
As such, the browser generates a visual representation of the ODF summary. Each bar contains some text, that tells you what exposure you are dealing with.
Note, that the duration of some exposures can be quite short, such that the text in the bar is not always readable. However, if the you hover your mouse over an exposure, some extra information about that exposure will pop up.
A toggle button in the tool bar will change the information presented in the xposure bars. This text can be the exposure id, instrument filter, or instrument mode.