I completely understand why Mohammad wants to hide "Select All" in the parameter-pull down. I am also anxiously looking for this, because sometimes the list of possible values in the pulldown is too big for the query and the report crashes.

The reason is that under the hood I dynamically construct a query-string with all the selected values to send it via LinkedServer to Oracle and therefore the length of the query-string cannot exceed 8K characters.

So I hope somebody knows a way to hide the "Select All" option in the pulldown menu.