Unfortunately there is currently no way to show only the total row on the table.
There are web services exposed in the broker and Tomcat WSC but these are not supported for external use in current releases.
I tried to reduce the height of the table in manual layout and then scroll down so that only the total row was visible and this was retained when the table updated, but not after loading the board again, the scroll position reverted to the top. This may be a workaround if you are prepared to set the scroll position after load.
Regards,
Stuart
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