When choosing in the Main Menu, the DVD or MPEG 2 in the "MPEG type" option,
in the "Advanced MPEG Settings", i can't change the "Aspect Ratio" (Video Settings)
to 16:9 and move to any other - "Advanced Video Settings"-"Audio Settings"-"Multiplexer Settings" without the "Aspect Ratio" (Video Settings) change itself again to 4:3 and even
if apply the option with OK, and in return the "Aspect Ratio" is again at 4:3.
Such as the "Multiplexing Type" (Multiplexer Settings) with the "DVD" option enabled.

Can someone explain if this is a detail that i missed or it's a bug?

Sorry about this post in this section - DVD Authoring - missed this detail.