Track width less than minimum track width

When trying to create a new Net Class or even just a predefined track width, I get an error “Track width less than minimum track width (0,7874)”

Where can I change this minimum track width? I’m on KiCad 5.1.9, and I don’t see any menu/option for that

File -> Board Setup -> Design Rules

@Miguel_Perez_Andrade 0.7874 mm is 31 mil, a strange number in either metric or imperial.
Can you send a screenshot of your Board Setup like immediately above?
The comma separator keeps triggering strange bugs over the years.

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