In order to get the same results we will reset the mesh options.

Open the preferences window selecting Utilities->Preferences.
Select the Meshing branch, click on Default values and then Apply.
Now select Mesh->Reset mesh data in order to ensure the geometry has no meshing property attached.
Select Mesh->Generate mesh.
A window comes up in which to enter the desired 2element size for the mesh to be generated. As default value could change from one version of GiD to another, insert 2 to get the same results as shown in images OK.
A meshing process window comes up. Then another window appears with information about the mesh generated. Click View mesh to visualize the mesh.
The result is the mesh in Figure. There are various surfaces and volumes. By default, mesh generation in GiD obtains unstructured meshes of triangles on surfaces and tetrahedra on volumes.

Generating the mesh by default.

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