DVT VHDL IDE User Guide
Rev. 21.1.43, 11 October 2021
You need to type the first letters of the component(entity, configuration, component) name, then press Ctrl+Space three (3) times. You can recognize component instances by their icon, it looks like a chip with ports ready to be glued in.
You can customize what gets generated from menu Window > Preferences > DVT > VHDL > Editor > Content Assist in the Auto-instantiation section.