was wondering what the black space on the record bar means

[Ifreborn]

What does the blue denote and what does the black denote on the bar in my picture. having an imposable time fining it in the documentation. Thank you all!

 

[MikeLud1]

What does the blue denote and what does the black denote on the bar in my picture. having an imposable time fining it in the documentation. Thank you all!

Blue is you have video recorded and black you don't