1.24 Inch tv has two ways in the following to turn off/on subtitles:

There is a subtitle on and off button "SUBT"/"CC" on the remote control. Just press the "SUBT"/"CC" button to turn off/on the subtitles.(US&CA is “CC”,EU is "SUBT")

Set both Analog Subtitle and Digital Subtitle to Off/On:

Menu-->Advanced Options->Subtitles-->Off/On

2.32/43/50/55/65/75 Inch tv subtitles can be turned off in the following way:

There is a subtitle on and off button "SUBT"/"CC" on the remote control. Just press the "SUBT"/"CC" button to turn off/on the subtitles.(US&CA is “CC”,EU is "SUBT")

YouTube-->press the "SUBT"/"CC" button-->”CC”