Hi Angelo,
Do you mean the website or the database?
What do you see which is not encoded on the way you want, is it data from the database or the static information as well?
If it is the information database, this has to do with the Collation of your database (read more here).
If you are working on an on-premises infrastructure with access to the database you can change that but if you are working in an OutSystems cloud, you cannot change that (you can open a ticket on OutSystems Support if they can do it but I doubt it).
Regards,
João