The shape editor helps with the editing of the static mesh parameters and visualization of the mesh information such as polygon count, drawcalls, collision meshes and so on.
The tool can be found in
Tools > Shape Editor main menu.
To check out a mesh in the Shape Editor, select a TSStatic mesh in the viewport and in the Inspector window click on the
Open in Shape Editor button. The editor will open with the selected mesh and you can inspect its properties and visualize info.