Permission to leave Court?

For 45 years of criminal practice in BC when I've finished my matters in Provincial Court I've just... left.
I now see counsel saying things like "that's my final matter, Your Honour, if I might have permission to leave".
I won't do that - I figure as an officer of the Court I have a right to be there, as well as a right to leave when I'm done.

Is this somehow a recent BC thing, or have I been a disrespectful asshole all these years and just didn't notice?