How to remove % sign from List of Values

Hi ,
I have shared list of values thats is based on SQL query. At runtime the select list default value is showing as "%". Can someone suggest how to remove % and replace with null (blank)
Thanks
Aali

In ist of Values region, if you select display null as 'Yes', in 'null display value' area use space tab or type something like ' - Select-' to replace %. Or, choose Display null as 'No.

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