Overlays
Display Stretch
Shows how much of a difference there is between UV coordinates and 3D coordinates. Blue means low distortion, while Red means high distortion. Choose to display the distortion of Angles or the Area.
UV Opacity
Opacity of the above UV overlays.
Display As
Controls how edges are shown.
Modified Edges
Show results of modifiers in the UV display.
Faces
Display faces over the image.
Show Metadata
Displays the metadata if they were set in the render tab’s panel.