Hello everyone,
After posting on the ArcGIS Enterprise Community without any results, I’m trying my luck with you, ArcGIS Online users.
I am working on a web map in Map Viewer that contains a large number of layers, including Feature Layers and Tile Layers. This requires organizing all these layers using groups and subgroups. For Feature Layers, there is no issue — I can move them wherever I want. However, for Tile Layers, it is more complicated.

Above is a Tile Layer called “Carte du Rhône de Avignon à Lapalud (1834)”, which consists of a mosaic named “Archives_Nationales_1834”.
I am wondering why it is not possible to move the mosaic outside of its original group, as can be done with Feature Layers ?
Thanks in advance!
Alix CL