HIDING TEXT BOX IN RDL

Hi All,
I have a text box with static data, I need to hide the textbox based on the
condition, if =Sum(Fields!TotalSessions.Value) > 1 then I need to show the
text box else I need to hide the text box.
How to write the condition and where do I add the text to the text box.
Balaji
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Visibility
Hidden Expression
Example;
=Iif(Sum(Fields!PO_.Value, "CustomerSubContractsDetail") <> 0, False, True)