Not sure if there is something wrong on my end:
With the February 2025 agol update, it seems like group layers automatically expand when data is hovered over them in a web map (i.e. I move a layer to be underneath a group layer. When I "pick up" my layer and go to bring it under the group layer, the group layer automatically expands. This goes for all group layers between my layer and my destination). Though this may be an intended functionality, it is difficult to work with data layers when it suddenly turns into 20 layers I'm trying to scroll past than the one or two group layers.
Was this an intentional update? Is there a way to disable this? Again, could just be something weird on my end!