aymanleeSince there are a bunch of CSV file in c:\Users\<windows user>\AppData\Roaming\Mionix\Hub\ I would assume getting rid of them would reset the data. I would backup them first though, just in case.
LE
The service collecting the data keeps the files of the last session locked. Also as long as the service is running, the Mionix Hub will show the previous sessions but without data. To completely remove the data:
1) Kill the mnx.exe process with Task Manager
2) Remove files in c:\Users\<windows user>\AppData\Roaming\Mionix\Hub\sessions
3) Restart the Mionix service via log off/log on or by starting a command prompt, switching to c:\Program Files (x86)\Mionix Hub and running "mnx.exe server run". It will start collecting data again.
c_r_z**Please do it at your own risk**
1. End the Mionix Hub Service process.
2. Start the Command Prompt
3. Locate the Mionix Hub Folder (default is C:\Program Files (x86)\Mionix Hub)
4. command: pushd C:\Program Files (x86)\Mionix Hub
5. command: mnx server kill
6. command: mnx naosqg metrics reset
7. command: mnx server run
8. Run Mionix Hub Service again.