Moving/rotating 2 or more molecules independently

I am trying to use Avogadro for teaching purposes. I would like to know if it were possible to build 2 molecules and “freeze” the first move at will the second.
Thanks for the help and Merry Christmas to all

Yes, in Avogadro 1.x, you can select a set of atoms and “freeze” them:

  1. Select the atoms or molecule you wish to fix in place.
  2. Go to Extensions -> Molecular Mechanics -> Fix Selected Atoms

I’ll mention that yes, this feature will make Avogadro 2. Hopefully I’ll get some free time in the next few weeks to finish the new optimization framework.