Grafana 7 - Gauge legend not showing up

First, I must admit that I’m fairly new to Grafana. Therefore, I may ask an obvious question and may not have the correct vocabulary. Please accept my apologies in advance if it is the case.

I just updated my instance of Grafana where I imported the Node-exporter full dashboard.

during the upgrade the Gauge got broken and some configuration is now showing up:

I believe that it is coming from the legend configuration:

As soon as I format from “Time Series” to “Table”, the legend disappears (which if OK).

But am I doing something wrong with it?
Is there a better way not to display the legend? or simply keep the value of instance?