I have an assembly consisting of two plates (Sheet Metal/2D) connected by 1D Beams:

However, it seems that no matter what I do, SolidWorks' own meshing of the beam end's profiles is propagating onto the plates and overriding any Mesh Controls applied to the plates: 

Of course, in principle it's good that SW tries to create nodes on the plates to match those for the profile mesh of the beams. But it is