There is not DAW Mode for Cubase, but you can use your mixer as audio interface for Cubase. You might want to check out the manual "Using_Your_StudioLive_Mixer_as_an_Audio_Interface_with_Universal_Control_V2_EN_25032019" (section 3.1), which you can find in the download area of your mixer.
www.presonus.com/support/downloads