Hi, Roberto Foini
Welcome to the Microsoft community.
It seems that Edge currently does not have an option to disable the zoom function. The only zoom-related features in Edge are the default page zoom size and the default zoom size for websites. There is no option to disable the zoom function for now. You can provide feedback to the developers by pressing Alt + Shift + I and wait for them to add this feature.
Best regards
Tommy Jin | Microsoft Community Support Specialist