Summary
These options allow you to choose between various styles for the Summary window.
General Information
The Summary window is normally used to display the players health, endurance, and power status at a minimum as shown below.

Regardless of which summary window you choose the following information will apply.
You can toggle the Player Power status Off and On by clicking on it with the mouse. The game does not save the status of buttons so when you log or rezone the power status will reappear.

If you click on the players name in the summary window, a Tabbed XP window will appear like the one shown below. To view the levels of a particular type of XP just click on the associated tab button.

The summary window is resizable. You can resize the window to make it larger. You can then overlay other windows such as Target Hit Points and the Compass on top of it to customize the way the summary window appears. The game does not save the size of this window so when you log or rezone the window will reappear with the default size as shown.

The four images to the left and right of the players name are buttons. The buttons are used to toggle Off and On floating windows that show Player Hit Points, Player Endurance, Player Power, and Target Hit Points as shown below.

Note: The background is actually transparent and not the blue as shown. I chose the color purple for the targets hit points so it is noticeably different than your own hit points color. The color of the targets name will change to the con color of the target as in the normal UI so you can determine its level in comparison to your own.
Note: Changing the summary window options will disable the close button in the summary window. You can re-enable the close button with this style window by selecting the option to turn the summary close button on after this option is applied.