Re: plugins. You leave them. The "+" is indicating they are included in the BP. They should be in your "Data" folder with the ".ghost" extension (assuming you configured Wrye to enable "ghosting"). They need to remain there for the next time you rebuild the BP, but you don't want them also included in your "load order" as seen by the game which is why Wrye uses "ghosting". As outlined earlier, once you build the BP, you are done. Don't try to overthink this. Just follow instructions.
By "crack in the window" I presume you are referring to the view through the space between the edge of the window frame and the "shade", where it appears you can see through the interior wall into the exterior? The "cracks" in the window panes are artwork.) If so, that is what is typical of an ENB detection of interior cells and transparency problem, which suggests to me that you have not in fact removed ENB as you believe. "Disabling" is not sufficient because this is a "post-processor" and shader which operates outside of the game itself. Please see "Issue - ENB is not working" and follow the reverse of the install instructions to remove it. In particular you need to remove the "D3D9.dll" file installed in the game folder for ENB.
I deleted everything associated with it, and both anti-aliasing and anisotropic filtering is still off. I can still see through the window, and behind the building. And yes, I was referring to that crack where you see the tumbleweed on the other side.
Unless I missed something. Here is what my game folder looks like right now.