Tow away alarm Sprinter 313 CDI 2014

Hello, I’ve just joined the group. My partner and I have just bought on ex DHL van and he’s mid campervan conversion. Question, I can’t seem to locate the buttons on the overhead dash (according to the manual we have) to turn off the tow away and interior sensor which might kick in the alarm when the van is on a ferry. Any ideas on how I would turn this off, there is alarm.... I keep setting the dam thing off as I’m leaning the security system. Please let me know if the group needs more information. My sincere thanks in advance for any help. All the best. Melanie.