When you create a session in Canvas, it can have a time limit you can check No time limit (for long-running conferences).
Regardless of which way you choose, it will appear under New Conferences.
At any time you can select End to end the conference. A pop up message will appear to confirm you would like to end this conference.
Selecting End will remove users' ability to join the conference and ends the live conference.
Select Ok to end the conference.
The conference will now appear under Concluded Conferences along with any associated recordings.
The second is through the BigBlueButton meeting interface.
As a moderator, you are able to end the meeting on log out of the BigBlueButton.
Open the settings menu, located in the upper right hand corner of the interface (the three vertical ellipsis) then choose End Meeting from the listed options.
A final pop up will prompt you to confirm you wish to log out and end the conference for all participants. Choose Yes.