Triggering a Pop-up from the Search Bar
In the October 2023 ArcGIS Online release, ESRI added one of the most commonly requested enhancements to Experience Builder, the option to trigger a pop-up from the search bar. Unfortunately, the option to do this is a bit hard to find. In the settings for the Map Widget, scroll all the way to the bottom of the Content tab. (It's a long way down.) Now, select Show pop-up on feature selection. Turn off the built-in search bar on the map and add and configure a Search Widget. (The built-in search tool will also trigger a popup, but it will likely not be the popup you are looking for.)
That's it. Pop-ups should now activate from the search bar.
Note: At time of writing this option is only available in ArcGIS Online and Developer Edition 1.13. Expect it to be added to ArcGIS Enterprise in 11.3.