Cubase LE 9.5.41 Set Up - Audio Input

Hi, having trouble setting up for the first time on a Mac with up to date OS.

Managed to get Cubase to recognise my Alesis Multimix4 USB FX in Outputs in the Audio Connections Set Up, but in the Inputs although the correct name USB AUDIO CODEC can be pulled down when I click it won’t save (as it will on the Outputs Tab). It just defaults back to Not Connected.

Does anyone have any ideas on how to solve the problem please?