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I'm guessing you want the text size of the tolerance to be the same size as the nominal value of the dimension?
The tolerance appearance is controlled by the Tolerance Description. CATIA comes with several Tolerance Descriptions, but your CATIA administrator my have added or modified one to meet company standards.
Try selecting the dimension, and change the Tolerance Description. It's probably currently set to TOL_NUM2. Try changing it to ANS_NUM2 or TOL_!.0
If you can't find one that looks good, go see your administrator.