Polycom RMX 2000 ユーザーズマニュアル

In the conference list, select the conference you wish to delete and 
click the Delete Conference ( ) button.
You are prompted for confirmation.   

Click OK to terminate the conference.

While the conference is running you can change the video layout and 

select one of 24 video layouts supported by the RMX.
The initial video layout is selected in the conference Profile.
To change the video layout of a conference:
1

In the Conference Properties dialog box, select Video Settings.