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If I am not mistaken, you would like to use a single text box to capture the date from your users instead of using the multi-drop down menu options provided within the Date Field. If this is correct, unfortunately there are no options within the date field settings that can be used to modify any aspect of its size. However, if you wish, you can explore the Date Picker Widget that allows the user to select a date from the calender which is then stored and represented in whatever format you desire (MM/DD/YYYY).
You can view a demo here.
I hope this helps. Feel free to contact us if further support is needed.