All five of those odd windows are custom DarqUI components. Left to right they are Icon Bar, Extended Player Window, Stat Monitor and Gear Buff Macros. The one on the right is the Maintained Spell Monitor. If you mouse over the upper left-hand corner of any of them, you'll get a blue gem button. Click that and you'll open the window manager setup page, and from there click the purple Help icon at the top.
There should be enough info there to give you a basic idea of why you would want to use the window, how to configure it to your preferences, and how to turn it off if you're not interested in using it.
DarqUI tries to conform to the overall look and feel of the default UI, and the expectation is that players will have already settled on a layout for their windows prior to installing DarqUI. So we've never developed any recommended window arrangements since it's such a matter of personal preference.
I will say that very soon your hotbars will most likely start filling up, and you may end up with most or all of the 10 hotbars on the screen at once. In those cases they dominate the rest of the UI, and everything else gets positioned secondary to them.
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