Thank u all for sharing with me info regarding my question. :smileywink:
Here is the offical TAC answer regarding this question (At least for now) :
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The option to select ALL in the data filter from Access Tracker is removed from Clearpass 6.x onwards. This feature was a process overhead on the Publisher and hence it was removed from 6.x.
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Have a great week you all AirHeads :)
Me.