If you are running Cubase like on this image then it is not Cubase's fault.
You can make it look however you like. Mine looks nothing like the mess you posted after setting up the way I want. Why do you even need a tiny mixer screen on the bottom? Why do you need the left panel open at all times if you do not use it? Why have you not changed the colours to something better?
Do not blame Cubase for being lazy to make it look great and totally uncluttered.
This is what mine looks like



