Expression editor Data tab

Hi,

There is supposed to be a Data tab, Functions and Rules and Constant tab on the expression editor. 

However, I am not able to see these tabs on my expression editor. Being new to Appian I am sure I am not doing something in order to view these tab. Can someone help ??

Of course not a big problem.. I can always type the expression but just wondering why am I unable to see these tabs

thanks in advance

jaideep

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