Hi @Giorgio_Alcantara, thanks for reaching out and sharing your feedback with us!
We already have a request for the option to have a description field in sections, I suggest you to add your vote here:
In regards to your request to increase the limit of characters shown in the section’s title in List view. This will depend on how many fields you are showing in your List and how expanded in the title. You can hide some custom fields to make more space for the sections title.
Let me know if you have any other questions! 