Your 2016 C205 will have either the Audio20 infotainment system with the optional Garmin Map Pilot navigation on SD-Card, of the higher-end COMAND NTG5*2 with the built-in navigation system on internal HDD. The latter will have a bigger screen than the former.
So if you have Audio20, an upgrade to COMAND NTG5*2 infotainment unit with the bigger screen is possible but expensive - contact
[email protected] with your VIN for a quote. BTW, they can also fit Apple CarPlay / Android Auto to your car.
If you already have COMAND, then your only option for a bigger screen is a non-MB Chinese 10.25" joby as nas2021 said.