I don't know why Quickbooks changed it to new format of invoicing. I am not able to go to 5 digits after a decimal point in Products and Service. It defaults to 2 digits

Welcome to the Community.

I am aware of the advantages of businesses like yours to be able to show 5 decimal points as the amount in an invoice. I want QuickBooks Online (QBO) to have this feature as much as you do.

QuickBooks is designed to round off the total amount in invoices to two decimal places, however, the rate may vary based on the quantity, amount, or tax associated with your transaction. You have the option to adjust the rounding to two decimal places in the Rate column to match it with the Amount column.

That said, I strongly urge you to share your thoughts with our software engineers. They carefully examine customer feedback, especially when determining how to improve QuickBooks.

Here's how:

1. Sign in to your QuickBooks Online account.
2. Go to the Gear icon and select Feedback.
3. Type in your suggestion and click Next.

Here's how you can mark your invoices as paid manually: Record invoice payments in QuickBooks Online.

Feel free to click the Reply button below if you have questions about invoicing in QuickBooks Online. I'm always here to help. Have a great day.