The default plot (big yellow dots with little orange dots between them) shows the moon's topocentric libration for the month [topocentric means as seen from your location as specified in the Configuration screen]. The plot tends to oscillate between daily positions.
The second plot available shows the moon's Geocentric libration (i.e. as it would be seen from the centre of the Earth), This plot is made up of light blue dots connected by darker blue lines. It's a much smoother plot since it doesn't account for your changing position relative to the moon as each day wears on.
The second pane, at top right of the screen, displays the maximum and minimum geocentric librations for the selected month. This is the same information that's provided in the monthly sky notes section of some of the astronomy magazines. The data is presented in the standard format as an overall figure in a specific direction (e.g.: 6.5° in PA 275.1°).
The calculation of these max and min figures can take a few seconds (or longer on older PCs), so these figures are calculated only when the month or the year has been changed on the main LunarPhase Pro screen. There's no need for the max/min figures to be recalculated if the Lunar Libration screen is being viewed for different days in the same month.
The third pane, at bottom right, shows the moon's phase and point of maximum libration (the yellow dot) for the date and time on LunarPhase Pro's main screen. Clicking on any of the maximum and minimum libration times (in the pane above) will cause the moon image to change to show the phase and libration of the selected max/min libration time/date.
Note that the moon views presented in this pane are those as would be seen through the optical configuration you've already selected on the main LunarPhase Pro screen.
The third icon on this screen's toolbar prints out the current diagram, along with the maximum and minimum geocentric librations for the selected month. The current moon diagram, with the yellow dot indicating the maximum libration point for the selected time and date is also included on the printout.
The fourth toolbar icon lets you save the libration diagram (what's in the leftmost pane) to a JPG file. The file dialog that pops up lets you change the default filename and/or directory if you so wish.