[HalfEmptY]

In almost every title i don't have any subtitles streams (Kodi 19 and Kodi 18 nightly - latest and previous).

What system are you running Kodi on?

I'm on NVIDIA SHIELD v2. I'm in Poland - don't know if that info is important. I have subs in "13 Commandments" which is 1080p, but every 4k movie or tv show that I checked don't have any subs.

If you have the shield (gaming edition) (w/game controller)

The solution I've found for missing subtltles with this plugin, is to:
1. Make sure you are using a viable sub service (I'm using opensubtitles for subs)
2. In Kodi setting - choose Forced Only for subtitles
3. In Netflix Plugin under playback where it says "Disable subtitles if there are no forced subtitle streams" ..make sure that is off.
4. Use your game controller, (during shows playback) push down on the left joystick to toggle the subtitles on and off. If there are no subtles for a particular show, you will see a message saying something like no subs available.

If you just have the remote, you may have to search manually for some subtitles. Depending on which Kodi skin your using, you should be able to search manually in the video player settings during playback, or you may be able to toggle the subs on and off from there.
I'm using the Atom1c Bomb skin so I don't have some of those options in the video player setting itself. Some player settings my be a little different depending on the skin you are using, but most options are available.