When working in an Element Graph, there are two ways to export meshes: directly from the Viewport and with the Image and Data Output Export panel.
Meshes can be exported directly from the Viewport to export a mesh:
Viewport by clicking on the output pin of a mesh node or right-clicking the node and choosing View Mesh from the contextual menu.Export Viewport Scene button or press Cmd/Ctrl + M.Save.To export meshes with the Image and Data Output Export panel, a graph output for the mesh has to be created first. This will provide the mesh data to the export panel when writing files to disk.

There are a few ways to open the Image and Data Output Export panel:
File > Export Image and Data Outputs.Image and Data Outputs button.To export a mesh with the export dialog:
Image and Data Outputs is set to true.Export.When using a custom output template, be sure to enable the boolean switch for any mesh outputs under the
Image and Data Outputssection of theImage and Data OutputExport panel. They are disabled by default.