Hello there, @ssvdma.
Let me share some additional information about changing templates for sales receipts in QuickBooks Online (QBO).
On the Sales Receipt page, simply click the Customize option, then choose the template. Please see the screenshot below for visual preferences.

On top of that, I've also included this reference for a compilation of articles you can read while working with us: Sales and Customer for QuickBooks Online.
Additionally, there are several financial reports you can run to track your sales income in QuickBooks. They will show you helpful insights on the things you buy and sell, and the status of your inventory.
If there's anything else that I can help you with, please let me know in the comments below. I'll be here to lend a hand.