Date Picker Date Format

I have a displayform with a DatePicker that has 'Include Time Picker': False, 'Date Format': Short and 'Initial Date': Use current date.

When the displayform opens, the date shows as 'Sep 23, 2022 00:00'. On opening the calendar, this changes to '09/23/2022' (you can see it flash just before the calendar covers the textbox).

I would like to set the date format to '23/09/2022' when the displayform opens and also keep the same format when using the date picker.

Any suggestions?

I have tried to modify the date picker settings in c:\inetpub\..\HTML5Viewer\Resources\Locales\Mapping.Infrastructure.en-US.json, but it made no difference

I am using GE and viewer 4.14.5