The gizmo can be used to manipulate objects in the scene, a user can create a gizmo using a Developer Tool or a Scene Inspector.
Usage
While the user has a Developer Tool equipped they can grab the handles of the gizmo to move, rotate, and scale the object the gizmo is attached to.
Currently having a lot of Gizmos in a world, or selecting a slot that has a lot of slots in its hierarchy, will cause the world to lag initially and/or have a performance drop as the Gizmo has to render and encapsulate all the slots within its bounds. When you are not using the Gizmo, it would be kind to deselect them when no one is working with them.