There definitley is no DAW Mode for Cubase, except the "normal" way of using Cubase with StudioLive mixers. The "how to" is described in the
Using_Your_StudioLive_Mixer_as_an_Audio_Interface_with_Universal_Control_V2_EN_25032019
manual in section 3 "Using the StudioLive with Popular Audio Applications" and 3.1, which you can find in the download area of your mixer here in the PreSonus web site.