I've tested out the builder thus far using the online template of map viewer. Here's some of the issues and comments that I have thus far from my experience using the experience builder (pun intended):
I will say so far that it is nice to be able to switch between 2d and 3d and I'm curious to see how this is implemented to match the other tools available with web appbuilder. The concern I have there is that this might clog up the options a bit when trying to select the appropriate action or widget you want.
Also, is this going to usurp the operations dashboard solution?
Please see my responses below:
Operations Dashboard and Experience Builder are two separate products. You can use both of these products to create a unique experience. Check out this example https://experience.arcgis.com/stemapp/7fe0885bb4e04dc68aa23159f191cb7c
Let me know if you have any other questions.
Based on the preview it looks like there are some alignment issues. On the right of the fixed panel it looks like there is a gray scrolling bar, is that scrollable? Can you share the URL with me by sharing it with everyone? That URL would be something like https://experience.arcgis.com/stemapp/7fe0885bb4e04dc68aa23159f191cb7c.
In regards to allowing the change for all screen sizes, this is something we are currently reviewing regarding having messaging notifications, etc.