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You can stop participation anytime staying on a Zoom call, and also copy a link to invite others to the meeting (in Speakers Monitor):
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Leaving Zoom meeting
Being on a Zoom call, you can leave it anytime a) clicking “Zoom“ button on toolbar, or b) leaving Show mode, or c) closing your project:
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Signing out from Zoom
Being signed in with your Touchcast account, open “General“ tab of “Preferences“ window (Touchcast Director > Preferences…) and click “Sign Out“ near your Zoom account.
Removing from added apps
Being signed in in a browser with your Zoom account, open https://marketplace.zoom.us/user/installed and click “Remove“ near the app.