Getting an Experience Builder app designed the way you want, and to work properly is...
an experience.
I guess esri named it appropriately.

"Are you, experienced?" ~ Jimi Hendrix

https://arcg.is/1rXzvn2

Experience

@GeoDon I started a project in Experience Builder (not my choice), quickly figured out what it's about, managed to kick it to someone else. #phew
@AtanasE
I mean, it’s highly customizable. But so was the old web app builder. And web app builder kind of made sense. I think the trick is, make an EB template, and use it for all my apps, and just switch out the map it points to.
@GeoDon The project I started and then passed on was not just about mapping but also bespoke attribute data statistical analysis, so building a reusable template wouldn't have been worth it.