QuickBooks Online (QBO) allows language changes only in international versions, Antonio. For US-based accounts, changing the language to Spanish is currently unavailable in the Advanced settings.
However, you can use browser-based translation tools such as Google Translate to to help your team interact with QBO in Spanish more effectively.
This link also provides tutorials for your team to learn about the platform in Spanish: Configurando y navegando QuickBooks.
Let us know in the comments if you have more queries. We'll stay in the loop to ensure all your concerns are addressed.
