These facilities usually have various durations that are relatively short. Some of them say an institution can borrow from the Bank of Canada overnight, sometimes for 30 days, sometimes for 90 days. The $41 billion peak was the total outstanding, which would have had a variety of terms, and some of it has rolled off and then not been renewed at the initiative of the financial institution that had taken advantage of it.
So it's not that the bank is withdrawing access. The limit is there, and financial institutions have been reducing their use of it relative to the peak in the fall.