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There is probably an ICA parameter that controls this function - Citrix ICA parameters document
Once you determine the ICA parameter and appropriate value, you can have APM insert the required ICA parameters into the receiver ICA client file prior to being sent to the client. This is done by adding the ICA values to the relevant APM remote desktop profile within the custom parameters field. The latest Citrix iApp does have an option for adding ICA parameters for you if you are running 12.0 on your BIG-IPs. The option regarding adding ICA parameters within the iApp is only present in advanced configuration mode and while running 12.0.
Page 23 of the Citrix Deployment guide has additional information regarding this iApp option.
Sometimes the easiest way to determine the relevant ICA parameters is to look at the ICA file of a client that has the behavior you expect.