on the Glance watch face, what does the top arc bar represent? Sometimes orange sometime blue

on the Glance watch face, what does the top arc bar represent? Sometimes orange sometime blue

what does the top arc bar represent?
You can configure this in the settings.
Ok, thanks....new to this watch...how do I do this...where are the settings?
In the Connect IQ app.
My watchfaces (displaydesigns) - select - Settings.