Murmur has two user types:

Workspace admins can change any member's user type by going to Workspace Settings (just click on the gear icon next to your workspace name). From the list of workspace members, click on a user's three-dot icon, then:

Note that none of the actions above are permanent! If you ever want to re-add someone you removed from the workspace, just invite them again. Or, if you removed a user's admin permissions and want to reinstate them, you can do so in your workspace settings.

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