You can turn off all the sum channels in a PRTG Network Monitor configuration by editing the XML file where PRTG stores its configuration data. Here is what you need to do:
1. Stop the PRTG Core server
2. Make a backup copy of PRTG Configuration.dat (!)
3. load "PRTG Configuration.dat" file from PRTG's data folder into a text editor
Now two sets of search and replace must be made (you will need to use regular expressions to do this):
4. Turn on Individual Channel Selection for all sensors (Note: * is a used as a wildcard here) :
Replace
<channeldisplaytype>*1*</channeldisplaytype>
with
<channeldisplaytype>0</channeldisplaytype>
5. Turn off all SUM channels
Search for all sum channels' "show" XML-property
<sumchannel *
<show>*1*</show>
and replace the <show> tag with
<show>0</show>
6. At the end save the XML file and
7. Restart PRTG Core Server process.
You can of course also use an XML editor to do this.