The theme is updated to the latest version.
Maybe I explained myself wrong:
the navigation label is deactivated and the menu is correct in the PC.
If I look at it with the smartphone, it does not work and the label remains visible.
On your site using 4.16.1 theme version, but latest one is 4.17.
But you are right, even with latest theme version the options to hide label does not work on mobile. I’ve sent your notice to our developers, this will be fixed in next theme update.