Here is a link to the manual.
Check out page 30 To use the “Control Center” software to change the presets.
But you can make the changes directly on the device.
Page 20 will tell you how to change the settings and save a preset to be used with Cubase. The section is called “Global” but that is misleading, and they even say so in the manual.
You don’t have to disable using the Keylab with Arturia software, just make a preset specific to Cubase.
Go through and assign everything to a CC . Put it on Channel 16 and you shouldn’t clash with anything. (Section 3.7 on page 22).
But if you want to know what you might clash with, here is a list.
https://www.musiker-board.de/attachments/cubase-midi-cc-chart-pdf.471798/