Hello there, @fghjui98765. I'm here to share details about customizing invoices in QuickBooks Online (QBO). This way, you're able to manage the information added to your transactions accordingly.

You're able to edit the labels of your invoices when you customise them in QBO. Based on your issue above, it seems that you want to remove the Description (detail) column of your invoice content. When you've already unchecked the said column when customised your invoice, you just need to make sure you're using the appropriate template before printing, emailing, or saving the transaction as a PDF. With this, the Description column won't be included. Please see the attached screenshots below for your reference.

To learn more about this, you can refer to this article: Customise invoices in QuickBooks Online.

Also, you're able to send reminders to customers when their invoices are or soon to be overdue in QBO. If you wish to learn more about this, I'd recommend checking out this article: Invoice reminders in QuickBooks Online. It includes steps on how to manually and automatically send invoice reminders.

Let me know in the comments below if you have other concerns about customizing invoices in QBO. I'm just around to help. Take care always.