In OMEdit, right click on "ModelicaServices" then "Unload". Next, go to your OpenModelica folder, then lib/omlibrary/ModelicaServices 3.2.1 modelica3d and load the "package.mo" file found there. You'll get a new ModelicaServices package loaded into OMEdit.

Expand that package, go to Modelica3d, then drag the Controller element onto your diagram. You'll have to do this package unload/reload every time unless you change your default settings, it doesn't stick by itself.

Also before running your simulation, run dbus-server.py in \lib\omlibrary-modelica3d\osg-gtk. You'll need Python and some other components as well, it's documented in the user guide for Modelica3D.