The UVEditor looks like the upper image and consists of three areas.
Toolbar - Most frequently used tools. 4 gizmos (Move, Rotate, Scale, Box), 4 elements (UV, Edge, Polygon, UV Island) and, Settings and Cursor icons from left to right.
Menu - All tools’ icons are located here.
Property - Properties of the current tool.
WorkingArea - This is used for viewing and editing the UVs.
The polygons created in UModeler basically have UVs, which have tiling charactericstic, generated automatically based on position and normal of each vertex. From UModeler 2.0 those UVs can be unwrapped and edited manually using UVEditor. Both types of UVs can exist in one mesh at the same time.