Hello Sebastien,
Take a look at "Account", at "What's new?" and browse through all the items described.
What's New?
@Sébastien-NUNES Hi Sebastien, as far as I know this is not possible. It would however be a very welcome addition.
I would prefer to have the Michelin layer as default.
@Sébastien-NUNES Your picture shows the map overlays. It is not possible to select a default overlay map. However, you can choose a default planning map when you have a gold account. OSM, Here or TomTom.