Thank you for your interest! I'm sorry, I don't understand your question. Are you talking about the extra, linear detail in the backsplash? Please be more specific.

Typically we
finish tiling where there is a raw edge in a couple of ways 1) use a bullnose tile (there are some of
these that are kind of a pencil size bullnose),
2) use a “Schluter” strip (names for the company who first created them
(this is a cutable “L” strip that fits behind the field tile and finishes the
side of it as well) this must be installed before the tile is applied . . . not workable on your project), 3)
you could purchase a decorative, coordinating tile strip to finish the
ends and 4) you could use a thicker bead of caulk on that edge to hide the raw ends of the glass.

Hope this helps!

Jeane