In the ArcGIS Geoprocessing Options, the checkbox "Results are temporary by default" exists. As it is described in the handbook, I want to check the box to store geoprocessing outputs temporary. I also checked the "Add results of geoprocessing operations to the display" box, as it is recommended. Actually, the geoprocessing result should now be deleted, if I close the mxd without saving.
But nevertheless, the result is not deleted from the disk if I close the map. The "Data -> Make Permanent" function is also still greyed out.
I already tried different output locations and different versions (10.5 and 10.6), but without success.
Thanks in advance for your support!