I recently added a new Declarative Action to one of our production workspaces. This DA uses a modeless dialog to display content.

By default, when a modeless dialog is first implemented on a record page, UI Builder places a placeholder container at the top of the page. While this is standard, it is causing intermittent layout disruptions—specifically when switching between Related List tabs.

Fix

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To resolve this, I moved the placeholder container into an internal page container (specifically, next to the Action Bar). Relocating it from the top level of the page hierarchy successfully eliminated the layout issues. 😎

Jan