By checking the Solace console I found that the private_monitor__ contains a (query) parameter which is not present (or documented) in the url.
Exemple for queue listing filtered by owner:
https://hostname:943/SEMP/v2/__private_monitor __ /msgVpns/myVpn/queues?where=owner%3D%3DaGivenClient&select=msgVpnName,queueName,ingressEnabled,egressEnabled,accessType,partitionCount,eventMsgSpoolUsageThreshold,msgs.count,msgSpoolUsage,maxMsgSpoolUsage,bindCount,replayState,durable&count=20& forceFullPage=true
I am wondering what does the parameter forceFullPage=true because if I use it with the /monitor/ (public) I see no difference (with true or false).