Here's a draft of a question you could post on the Esri Community forum, tailored for the Experience Builder section:
Subject: How to achieve "openAtStart" widget functionality in Experience Builder (similar to Web AppBuilder)?
Hi Everyone,
In Web AppBuilder, we frequently utilized the "openAtStart": true property within a widget's configuration to ensure it automatically opened when the application launched. This was a really useful feature for guiding users or immediately presenting key information.
We're now transitioning more of our development to Experience Builder and are wondering if there's an equivalent or similar method to achieve this "open at start" behavior for a widget. We've been looking through the Experience Builder documentation and settings, but haven't found a direct parallel.