By default, SuitePOS renders the screen display in "Light Mode". All iOS devices can now operate in "Dark" or "Light" mode and SuitePOS has been re-designed in order to support both.
To enable this feature, you simply go Settings/Display & Brightness on the device and set your device accordingly. You can set it so it is permanently "Light" or "Dark" or even base it off a schedule. eg. In the evening "Dark", during the day, "Light".