@FrancescoCotana, the file that you shared has been uploaded as a CSV so that's one of the reasons it's not recognized as a proper table/layer hence you can't see the time settings. Another thing I noticed in you CSV itself is that it requires clean up so that one Excel can recognize individual columns and then so will AGOL.
Also after cleaning up the CSV when you upload it AGOL make sure to select the first option as shown below and select coordinate columns if the dataset has any in the next steps. And if the date/time column is properly formatted in Excel then while uploading the CSV, AGOL will automatically recognize that column as date type. Once the dataset has been uploaded then you should be able to configure time settings.
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