Dragging a session into or out of a group used to end with a visible jump: the row snapped to its indent, and a dissolving group header shoved everything below it in a single frame. The whole drop now plays as one smooth glide. While you drag, the row even leans into its future home: cross a group boundary and the indent slides in or out under your pointer, so you can see exactly where the session will land before you let go.

You can also start a group from just one session now. Right click any bubble and pick New Group: the session gets its header immediately, the name field opens so you can label it, and other sessions can be dragged in whenever you are ready. No need to gather two sessions first. If you had a multi-selection going elsewhere in the dock, it survives.

Both improvements respect Reduce Motion: with it on, drops settle instantly, no gliding.