I tried to download your dropbox file for YouTube and it didnt work for me.
could you post F3D file or upload it to fireshare.
When using left sideway compensation those red arrows do not relate to the final toolpath direction.
when using Center they do.
What they do show is if they are in the inside of a contour they on cut on that side of the line and if they are on the outside of the contour they will cut on the outside of the line. ( on odd shaped or smaller contours this may appear random)
I tried to explain it once on this post. In my example with the circle the red arrow does not corollate to final toolpath direction, yet the toolpath generates correctly for plasma.
If you watch this live stream i just made . the toolpaths at the end confirm the proper toolpath direct rules even though i only used one click to select while using left compensation.