Open this list field under Search and click on Geometric 3D.

Click on Select STL file.

Select the desired file. Afterwards click on Open, in order to upload the file.

-> The uploaded part is displayed.

Click on Search.

-> The search is performed over all available catalogs and the results are listed. At each search result the geometrical similarity is displayed.

Under Filter by catalog you can select a certain catalog and in this way restrict the result list.