Alright
Follow the below steps to format a drive with ReFS:
- Open Registry Editor (regedit.exe).
- Navigate to: *HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control*
- Create a new key under Control: MiniNT
- Under this key, create a DWORD32 (32 bit) value.
- Now type AllowRefsFormatOverNonmirrorVolume (as the value name) and set the value to 1.
- Close Registry Editor and restart the system.
- Open Admin Command Prompt and type "format z: /u /fs:refs /i:enable". This will format your Z: drive with ReFS.
If you are not getting the Format option (in your screenshot), file a Feedback on Feedback Hub