While running AECOsim Building Designer, I have set a file of ceiling support hangers made of RHS Steel Sections. The length of some need to be edited but the Edit Handles do not appear to be working on any of the element in this file.
Firstly, you need to check that the structural sections used by the columns is from a local section table and not from a different xml. If it is from a different section file, you'll have to manually load that first in order to use the Edit Handles - without the proper section file loaded, the applicable parametric size data isn't available so typical structural modifications won't be possible.