Welcome to the Community, @PBCW. I'll get you guided about applying custom form styles in the QuickBooks Mobile App.
The QuickBooks Mobile App is designed for business owners to manage their businesses anytime and anywhere. Along with that is the limited feature it has offered compared to accessing your company file using a web browser. They also differ in their interface and how it is navigated.
Concerning managing invoice form style, it's advised to customize and apply it before switching to the mobile app. Therefore, there's no option to make the interface the same when logged into a web browser.
On the other hand, please see this article to know what features are available in the QuickBooks mobile app: Compare mobile app features.
Feel free to ask any more questions you may have regarding the application's preference. You can do so by clicking the Reply button. We prioritize your satisfaction, so please don't hesitate to ask. Take care!
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