The embedding frame grows and shrinks to fit your app's content automatically, so users don't see extra scrollbars or clipped content.
Where: This change applies to Lightning Experience, Experience Cloud LWR and Aura sites, and the Salesforce mobile app in Enterprise, Performance, Unlimited, Developer, and Partner Developer editions hosted on Hyperforce where English is the default language.
When: This feature is available starting September 14, 2026.
Who: This change is for developers who build embedded apps and who can create Lightning web components.
Why: Show the embedded app at its natural size without manual height settings or nested scrollbars.
How: Auto-resize is on by default, so you don't configure anything. So that the frame
can size to your content, avoid fixed full-viewport heights such as height:
100vh in your app, which can cause a resize loop.