@DahuNejc the main focus of Vdash is coding, not service and diagnostics. Some functions are just not implemented (jet), or are located where you don't expect them. Lots of functions have to be started from the CEM for example.
You might also want to take a look at this program https://vtool.info/ which is made with diagnostic and service as main focus.
There is also a mobile phone app called V-Tool https://v-tool.app/ which should have the roof calibration function.