Little White Box?

I haven’t been able to search for this answer due to not knowing what words to use, but I was wondering if someone could tell me what THIS is:

It seems to appear on the first tracks I make then randomly will stop appearing on subsequent tracks (as shown in picture). Any ideas? Manual page #'s? Search terms?

These are the channels selected by a remote control device at the moment.

Ah, so say like… the HyperControl function of my AxiomPro 61? That shows what tracks it’s engaging?