And it's default keyboard shortcut (on PC at least) is [G].
Before you ask, for Group Sneak it's Shift + C.
For the record in the patch it was introduced used to be an undocumented change and have no keybinding by default.
On one hand I'd say that is so bizarre that Larian thought people wouldn't appreciate the function.
On the other hand, let's keep in mind that they are the one who came up with the toilet chain system to begin with, so maybe it shouldn't surprise me that much that they have a bad relationship with comfortable UIs.
