The Viewport panel shows a rendered (or optionally wireframe) view of the Static Mesh asset. This allows you to examine the Static Mesh as it would be rendered in-game. This viewport also allows you to preview the bounds of the Static Mesh asset as well as its collision mesh, if one has been assigned. In addition, the UVs of the Static Mesh can be displayed.
Overlaid onto the Viewport panel is a set of statistics or information about the Static Mesh asset.
In this information you will find the following:
LOD - Displays the number of LOD (Levels of Detail) for the Static Mesh.
Triangles - Displays the number of triangles in the Static Mesh.
Vertices - Displays the number of vertices in the Static Mesh.
UV channels - Number of UV channels. Unique, non-overlapping UVs are required for shadow mapping.
Approx Size - Displays the approximate size (Length x Width x Height) of the Static Mesh in Unreal units with a scale of 1 in all axes.