How to set the exec queue size in server.conf to increase perfmon inputs?

We are trying to increase the size of exec queue since we check that for Perfmon and Wineventlog, it stores the queue there. We don't want to increase the parsingQueue since there are other data that we are forwarding. I try to set in server.conf: [queue=exec] maxSize = 10MB However, when we monitored the metric.log, the max_size_kb is still 500KB as it original were. The Forwarder we use is Universal Forwarder 6.4.1 Thanks