I had the same issue and actually when you are on the top right arrow (to restart), if you press right and the OK it opens the tracks and subtitles menu. The menu seems to be there but hidden on the right outside the screen.
Enjoy
! It shows me the subtitles options when I do this but I can’t actually click on them! Only font and back but not the other options
IPTV Smarters subtitles
in LG webOS Smart TV App Questions
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