Way to temporarily draw a uv grid over blender meshes? I have a scene where all of the objects have a material assigned to them.  However, it would be useful if I could temporarily assign them a special material which simply a texture map of a grid square.  The point of this would be to let me see the UV lines to help me make editing decisions.
As far as I can tell, Blender does not allow you to do this.  Am I wrong?  Is there some way to temporarily view my scene with this grid material and then switch back to the materials I've assigned?
Select your object, in a shader editor window create an image texture node, create a new UV grid image, mantaine the node unconnected and selected.
In the 3d window you can now select the solid viewport shading, in texture mode, to show your UV Grid.
By selecting the material texture nodes you can display the UV grid or the material images.