Again, sorry for English.
No, there is no parameter required.
I have mine set this way.
If the DS18B20 is connected before the inclusion, it should show the temperature straight on.
Maybe the DS sensor is faulty? Or maybe it is not wired correctly? I would double check the way you wired into the smart implant.
Try also power off and on Homey (leave it off for some 10mins)
Could you post a photo of the wiring?
