Hi,
1. Changing layout option during design time is available in the next release 15.1
3. Additional UI controls were also later added in a SP.
4. Go to Configure Display Parameters and change DateFormat and Set UserLocaleFormat to False.
Pls refer to the screenshot below.
Image may be NSFW.
Clik here to view.
I am not aware how to change the Value columns Label but you can set ShowLegend to False then Legend will not be displayed.
Regards,
Sriram