Are going through the menu and Selecting Service Types and see something like:
"Ham :---"
If so its because you are scanning a Favorites List (or several FLs) and there are no channels with the given Service Type.
That's a normal situation. There is no cause for concern and no reason to take any action to re-set the scanner. (Even if you re-set the scanner, this condition would persist).
Also, a scanner "re-set" will NOT affect your DMR or ProVoice keys. Once entered, they stay entered. They are more or less "burned" into the firmware.
If you did want to do a "re-set", which is most commonly done with a possible SD card error, or you just want to wipe the slate clean, here is what you would do:
Connect the scanner to the computer and select Mass Storage.
Start Sentinel
Go to Scanner>Clear User Data
Press OK in the pop up window that appears. Follow any prompts that appear.
Folowing that, you'll have to re-load the full database and the profile which is done with the Scanner>Write to Scanner sequence.
From a technical standpoint, this is not a "re-set" of the scanner such as what you may have seen with older model scanners. Rather it's a re-installation of the firmware and wiping the memory of the full database, profile and Favorites Lists along with any stored recordings, etc.