Hi, @Federico Coppola ,
If you just created a new list and have the content type field in your new item form, I will assume that in this list, management of content types has been allowed. It will enable users to add more content types to the list and choose the proper during creation.
It seems you have no requirements about other content types, so please follow the steps below to disable management of content types and hide the content type field.
- Click on the gear button on your right top which opens the Settings menu, click on the List settings link
- In List settings, click on Advanced Settings. You can use Ctrl+F to find it more easily.
- Under the Allow management of content types? option, select No. Then click on OK.
Then it shall work for your list.
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