Let me first welcome you here in the Community, cargil-0355-gmai.
I'm here to guide you through the steps in changing the language of your invoice from Spanish to English. However, this is limited in some International QuickBooks version. We can do this in the Advanced tab.
Aside from the Advanced tab, you can also change the language in your browser settings. I'll guide you how:
For other browsers, I encourage you to check out this article to learn how to update the language: Microsoft Forms.
Additionally, I've included an article that'll help you send invoices using different languages in QuickBooks Online. This way, you'll be able to give translated invoices to your customers: Multilingual Invoicing.
Please let us know if you need assistance in managing your sales transactions. Doing so helps us provide accurate solutions for you.