yes @cerejacult Is correct, users are able to alter the appearance of subtitles within the system settings on various devices. I have particular knowledge of ■■■■■■ fire TV devices and android devices (both mobile devices and TV) unfortunately, these settings seem to be particularly well hidden. I don’t for the life of me understand why that is. Below is a link to a topic where in two separate replies I detailed how to access the subtitle settings on both ■■■■■■ fire TV devices and android TV devices
For me personally, the two most important settings for subtitle appearance are subtitle/text size and subtitle background colour. Reducing subtitle text size should stop parts of subtitle lines from being cut off.
Although it is fair to say that fire TV devices are better for large screen viewing as the subtitle settings with respect to text size or incremental. On android TV devices. If you change the subtitle text size small, allowing the long subtitle line to be display correctly. Some may not be able to see subtitles clearly from a distance. The difference in text size between small and medium on android TV devices is too large.
Subtitle appearance settings can also be changed and Viki’s browser-based player on the website
My typical subtitle settings are as follows
subtitle/text size: small
subtitle colour and subtitle background colour : white text on a black background