DVT SystemVerilog IDE User Guide
Rev. 20.1.38, 30 October 2020
You need to type the first letters of the module name, then press Ctrl+Space three (3) times. You can recognize module 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 > SystemVerilog > Editor > Content Assist in the Auto-instantiation section.