Hi Pradeep,
I have never used the mentioned hidden property before, but I think if you enable this property something strange will happen, something like MOM accepting the agent metrics. This also means MOM won't redirect the agent anymore, but that is not what I would call disabling loadbalancing
This property was originally intended for the CDV mode which is a stripped down version of MOM that does not redirect any agents.
There is no setting to revert the functionality back to pre-9.1 or disable LB.
My recommendation is just don't configure the loadbalancing.xml, is all we have at this point.
If you concern is about possible metric explosion affecting your collectors' metadata, you can configure the MOM to startup with introscope.enterprisemanager.loadbalancing.staywithhistoricalcollector=always this will force the agents to collect to the appropriate collectors, once all of your agents are reconnected, you can change the property value to notoverloaded to restore default load balancing behavior, see https://www.ca.com/us/services-support/ca-support/ca-support-online/knowledge-base-articles.TEC1526667.html?intcmp=searchresultclick&resultnum=2
I hope this helps,
Regards,
Sergio