It's a delight to see your post today, sivajaninerose.
Yes, you can customize the format, style and template of your invoices in QuickBooks Online (QBO).
Here's how to set up a new template and style it the way you want:
Click the Gear icon.
Under Your Company, click Custom Form Styles.
To create a new template, click the New style button in the upper right-hand corner.
Select Invoice.
Go to the Design tab to edit the template name, logo, color, font, and margins. Then, go to the Content tab to customize the header, body, and footer of the invoice template.