In the ruleset, you should also have the option for “Process Matching: Match all processes”.
I just tried it, works as expected.
You need to give this new check a name, of course. Perhaps that’s what confused you?
Turn on the online (context) help - “book” icon on the top right.
Then you see the description for this input field: “This name will be used in the description of the service”
Yes, this should probably be called “service name” instead.
So just enter something like “all”, then you’ll get a new service called “Process all” with the count you wanted.