Hello there.
The appearance of invoices in WhatsApp, including whether it is displayed in dark mode or light mode, is determined by the settings and preferences of the recipient's device or app.
You may want to consider suggesting that your customers change their WhatsApp theme to light mode.
Moreover, I'll be sharing this link to help personalize and add specific info to your sales forms: Customise invoices, estimates, and sales receipts in QuickBooks Online.
If you have any additional concerns about changing the mode when sending invoices in WhatsApp, please don't hesitate to return to this thread. I'm always available to assist you.
