Issue
AM/PM is cut off when using double-digit times in the Date/Time Control in Responsive Forms. This is a known issue in Nintex Forms 2013 2.11.4.2 and Nintex Forms 2016 4.3.3.21. This is strictly visual and has no functional impact on Responsive Forms.
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Resolution
Currently, the following font sizes produce these results:
12 - Fits properly.
14 - Begin to see 'M' be hidden.
16 and 18 - Hides half or most of the 'M'.