Hi,
I have found it it's in the ui.properties file :
## PROPERTY_START
## PROPERTY_NAME: maxKnownHostList
## PROPERTY_TYPE: Integer
## PROPERTY_DESCRIPTION
## Governs the number of known host keys to list in the SSH Profile screen.
## If this property is commented out or left blank or a non-integer or negative integer value is specified, default value of 1000 will be used against this property.
## PROPERTY_END
maxKnownHostList=1000
in case some one need it.
Regards,
Taha