Echo or other brand owners with Alexa integration can activate the multilingual mode of Alexa in the devices section of the Alexa app, entering the settings of the individual device and under the "language" item select the 'Italian/English' option among those among thoseavailable.
On Echo devices equipped with display, such as Echo Show, it is possible to enable the multilingual mode directly from the device, just scroll down the screen down to open the menu, then you have to make settings and then 'language' to find the available multilingual combinations.If the Italian/English or English/Italian options are not available inside the settings, you have to wait for the software update of the device, which can be forced by asking "Alexa, checks the presence of software updates".
In addition, Amazon also added the possibility of changing the language only using the voice, for example by saying "Alexa, speaks [desired language]" - choosing the English language with the preset Italian automatically enabled the multilingual mode on the device with the'Italian/English' option.