This TV has accessibility features in [Accessibility] such as a text-to-speech function for on-screen text, zooming to make text easier to read, and subtitles.
Press the XXX.GST (quick settings) button, then select [Settings] > [System] > [Accessibility] to configure the user assistive features.
[Accessibility] has a shortcut function so you can turn it on or off by pressing and holding the XXX.GLF (back) and [XXX.DWN] (down arrow) buttons on the remote control for 3 seconds.