The marking above the hyphen there is an underscore — it’s telling you that hitting shift-hyphen will give you an underscore.
You may be using software that supports inserting an em-dash when you hit that combination, but I don’t believe that it’s the keyboard layout that dictates that.
searches
It sounds like Microsoft Word does something similar:
Fun fact: on some keyboard layouts you can access the em dash easly
This is the most common Italian layout
You can see that you just need to press control+hyphen
The marking above the hyphen there is an underscore — it’s telling you that hitting shift-hyphen will give you an underscore.
You may be using software that supports inserting an em-dash when you hit that combination, but I don’t believe that it’s the keyboard layout that dictates that.
searches
It sounds like Microsoft Word does something similar:
https://www.avantixlearning.ca/microsoft-word/how-to-insert-an-em-dash-or-en-dash-in-a-word-document-4-ways/
No