Hello @eai5016,

Currently, we're unable to remove the letter "T" on the invoice. I can send a product request to our engineers in your behalf. They can consider this option added in the future update.

In the meantime, you'll want to check our blog to know what's new in QuickBooks Online. Feel free to click on this link: The QuickBooks Blog

I've also added our page about income and expenses for some helpful articles for your future tasks.

Please reach out to me anytime if you need help with anything else. I'd be glad to help. Thanks for posting and have a wonderful week.