The simluator has a different width for the dc in the GlanceView compared to the real device.
Hence the UI we see in the simulator will not match the UI on a real device.
Since I only a have a Forerunner 255S, I can only see this discrepancy for this device model.
Simulator says the dc has 171px width.
Real device says the dc has only 140px width.
Perhaps the simulator does not count correctly for the app icon?