Matrix at UC.Technology > Rooms> Delete rooms
When you leave rooms, they are no longer displayed in the room list in the left column. If the last person leaves the room, the room is archived for 7 days. After that, it is permanently deleted.

As the room administrator, you should first “kick” or remove all room members. Then you should leave the room as the last person, which will trigger its subsequent deletion by the server.

Matrix at UC.Technology > Rooms> Delete rooms
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