On the Advanced tab, if you modify the value of Maximum Threads, select Apply, then select Synchronize to update the value of the maximumThreads property in the Ant configuration script that defines the thread monitor:
Adding thread monitor properties
If you add configuration properties for a thread monitor, they are added to the configuration script. The next time you run the script, the properties are applied to the thread monitor.
Click Add Property.
Enter the property name and property value using this syntax:
propertyName propertyValue.
Click Apply to save your changes, then click Synchronize to update the configuration file.
Deleting thread monitor properties
Click Delete Property.
Click Apply, then click Synchronize.