[Newbies] Underscore in 3.9

[Ramiro Diaz Trepat]

Hello everyone,
    I started using the latest 3.9 image and there are no := there :)
Only underscores.
    Even when I write := it turns into _ when I save.
    I am sure there is a very silly option out there to deactivate
this behaviour.  Anyone can tell me?
    Thanks


    r.