When the word wrap is switched on (View/Word Wrap), the lines split at the end of the screen although they should split at a fixed column (Tools/Options/Editor/Split paragraph at column) -- the registry entry FixedColumnWrap
You seem to have CSS turned off.
Please don't fill out this field.
Nope, that is all correct. The options dialog clearly says that this is about the manual hard wrap that you find in the edit menu.
I mean, yes, it would be lovely to be able to soft wrap at a given line. We do not have this at the moment, but it is on the todo list.
This was a feature in TeXnicCenter 1.0, though. Why is it on the to-do list? Doesn't that mean it was removed in the first place?