Edit: I didn't read to the end of the thread before replying
There are two ways to check in calibre.
When the device is connected, right-click on the device button and select "Configure this device". The extended driver has more options. The first of the extra options is "Enable Extended Kobo Features".
The other ways is with the preferences. Open the preferences, go to "Plugins" and expand the "Device interface plugins". Calibre comes with two drivers for Kobo devices. "Kobo Reader Device Interface" handles the older devices and "Kobo Touch" handle all the current devices. If you have the extended driver it is "KoboTouchExtended" and will be used if it is enabled (not greyed out).
There is a third way to check on the Kobo device. If you are sending epubs to the device and they show up as kepubs in the device library, you are using the extended driver.