Is there a way to customize which basemaps appear in the basemap widget when it is enabled for a map in Experience Builder?
Was this ever resolved, I am running into the same issue.
No, this wasn't resolved. Went down to the DevSummit a coupleof week backs and reported it to the Experience Builder Product Manager. They didn't really seem to care. Kind of critical issue though I would say.
I am also having this issue. I embeded a Dashboard in an ArcGIS Experience and the basemaps show our organization's correctly when viewing the Dashboard but show the generic Esri basemaps when viewing the Experience.