Which feature would you use to customize invoices in QuickBooks Online?

The Customization Tool under the Gear icon is a powerful feature in QuickBooks Online that allows users to tailor their invoices to meet specific business needs. This tool provides various options for adjustment, such as changing the overall layout, adding logos, modifying colors, and selecting which details appear on the invoice. By utilizing this tool, businesses can create a professional and personalized invoice that aligns with their branding and enhances customer perception.

The other options, while relevant to various aspects of QuickBooks Online, do not specifically address the customization of invoices. Invoice Settings in Sales is primarily where you manage preferences related to invoicing, such as payment terms or default messages. The Theme option in Reports deals with the visual presentation of reports rather than invoices. Lastly, the Layout Designer found in Transactions pertains to customizing forms used in transactions, not specifically for invoices. Thus, the Customization Tool is indeed the appropriate choice for customizing invoices in QuickBooks Online.