In the current Web Map viewer you have the option of sharing the map as an embedded URL. This provides a clean web map which can be customized using URL parameters.
Does this functionality exist for the Map Viewer (Beta)?
What I trying to achieve is a simple editing app by using the Field Maps app and Map Viewer (Beta). I have configured the web map using Smart Forms to allow user update of a Feature Layer. We would like to embed this web map on our public facing web site rather than having to download and use the Field Maps mobile app.
If you look at the embed URL closely, you'll see that it's actually making use of a separate app called "Embed".
Technically, any web map item can be added to this app by supplying the map's itemID as one of the URL parameters. Currently, though, there is no built-in method of generating an embed link via the new Map Viewer.
It would be nice to have a simple method of making an embedded map using the ArcGIS JS 4.x library. I'd post an Idea in the ArcGIS Online group to see if it can get implemented.