Hello, I came to this thread looking for the same thing.
The functionality matrix says Overview Map has been added, but I cannot find it in Experience Builder:
Here is the page for Overview Map in old Web AppBuilder:
Thank you in advance for any help you can provide in finding this functionality in Exp Bldr.
Thank you. I tried your pan-solution with adding a red X on top of the second window, and it sorta works, perhaps a bit sketchy geographically. There must be some official solution though - otherwise I wouldn't think Esri would have called it as "Available in Experience Builder in ArcGIS Online" on the functionality matrix?