It is normal for only (1) modem icon (four bars increasing in height from left to right, see page 8 of the VidiU Go Reference Guide) to appear even if there are (2) Nodes or supported USB modems connected to the VidiU Go.
Older photos or videos may show the presence of (2) modem icons, but this was changed in subsequent firmware updates to allow more room for other elements on the front panel display.
Below is the current and expected behavior with only (1) modem icon:
current behavior with (1) modem icon
Below is an example of the deprecated behavior showing the presence of (2) modem icons:
older behavior with (2) modem icons