Dear Developers,
The group layer item type (as described here) is a great way to quickly build maps. And above all, it is supported when users want to add data through the add data widget in a configured experience. However, this does not transfer grouplayer configurations as set-up in AGOL (layer visibility scales, changed layer titles, etc) but the configuration from the source. I have provided screenshots to illustrate this possible bug/improvement.
Image 1: Group layer set-up as in ArcGIS online, this configuration is altered by us in AGOL as the source uses less user friendly map configurations. (Feature names, scale levels, attribute colors, etc)

Image 2: When the group layer is added by the end-user (through the add data widget) the less user friendly configuration of the source is used.

On a content management side I would like to transfer my user centered configured layers to layer groups. In my organisation not all sources we use are our own thus in many cases it is necessary to alter layer configuration in AGOL to be user friendly.
Thanks!
ECJRIJS