R2000i2 config.pro option documentation for: DISPLAY_COMPS_TO_ASSEMBLE            

display_comps_to_assemble

yes, no

(process assembly)

yesothe system brings the whole design model into memory and displays it on the screen. you can then pick process components from either the design model or the model tree.

noothe system does not bring the whole design model into memory. it displays only the model tree. as you pick process components from the model tree, the system brings them into memory.