What are these white markings in the track list?

Hi there
I became aware of some seemingly random vertical white lines / markings that appear in the Track List. (see screenshot circled with red) What are these and what are they good for?
(as you may see, they do not mark track categories, Quick links, or track colors)

Thank you
Cubase marking

AFAIK, These appear when you have a remote device working with Cubase. On my end, tracks are grouped by 8 ones, and it depends of the track selected location. Don’t know if it’s a general case and, most of all, the true usufulness of them…