Unnamed_253 file for dt08 folder – Extended Running Track.
This is one of the Stadium Editor options for a pitch surround.
There are two options:
01 Running Track – This gives the effect of a actual running track.
02 No Track – the white lines are deleted from the default file.
IMO, the default unnamed_253 gives the running track an uneven feel, but some may prefer it.
Put 01 or 02 inside your dt08 folder.
If you prefer the default file, delete the unnamed_253 from your dt08 folder.