Hi
I noted you had an issue with the "backlit keyboard". I also got an X395 in May. Just press the Function "Fn" key and the spacebar, this will activate the keyboard backlight. If you want to increase the brightness of the backlight, press the "Fn" key and spacebar again. You also do the same if you want to switch off the backlight.
I also find the Lenovo Toolbar useful in navigating the functions and features of the X395. If you go to theLenovo Vantage > Device > My Device Settings > Input & Accessories, it will show you hidden keyboard functions.
But if you want the full details, go to the Lenovo Vantage Toolbar, click "Support", scroll and find "Documentation" and click "User Guide".
The "User Guide" information will come up on your default browser (e.g. Internet Explorer, Microsoft Edge,Chrome, Firefox,etc).
Hope this information helps.