There is some problem with your Site Builder(Hosting).
The way your website looks like on mobile devices is definitely not a problem to the theme. (Try to switch to the default WordPress theme to see)
You need to look at the settings on your Web site builder (altervista).
You can check how your site should look on mobile devices by reducing the size of your browser’s window on your desktop computer.
In the meantime, I checked your website again and found that you still have a problem with the mobile view.
If you have a “Jetpack” plugin installed, it may be that you have enabled a “Mobile Theme ” in your Jetpack plugin. So if that is the case, you need to go to: Jetpack -> Settings -> Writing tab and scroll down to the Theme Enhancements and the “Enable the Jetpack Mobile theme” option and turn it off. https://prnt.sc/k2brhz