Hello @JudiRo,
You can select Save and close from the drop-down menu so your customer's invoices will not be sent after saving them. Let me show you how.
- Go to the +New button,
- Under CUSTOMERS, select Invoice.
- Fill in the necessary details for your customer's invoice.
- Select the Save and send menu.
- Click Save and close.
Additionally, I've got you this helpful article for the different methods you can start using in accepting payments from your customers: Record invoice payments in QuickBooks Online.
If you have any other questions, please let me know in the comments. I'll be here to help. Stay safe!