With no borders applied, I am wondering how why there are grayed L's in the
4 corners of the page appering as (_l , l_ ...), it seems as though they are
set to the page margins, yet theylook similar to those depicted in the page
border assigning.

I would like to know how to disable them, and a good start to that may be to
learn how they were enabled in the first place

Any help anyone can provide would be greatly appreciated!