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If you change your Date field from a string to a date (use the drop down menu on the field in the left data pane and select Change Data Type > Date), then you can format the date however you'd like.
To change the default format, use the drop down menu for the field in the left data pane and select Default Properties > Date Format. To change the format in a specific view/sheet, use the drop down menu for the field in the view and select Format.
In either case, for the format you specified above, you'll want to use a custom format with the string mm/YYYY