The default setting of the Accessibility shortcut function is set to a screen reading function, such as Screen reader (recommended) or TalkBack.
This function isn't available during the initial setup of your TV.
Depending on the model, when you use the function for the first time, a dialog box will appear to confirm the use of the Accessibility shortcut function.
For models released in 2020: The TV will read the title of the dialog Use Accessibility shortcut? Then, the TV will read the focused button TURN OFF SHORTCUT. Press the Right arrow button so that the TV will read TURN ON SHORTCUT. By pressing the Enter button, the Screen reader function is assigned to the shortcut function.
For models released before 2020: A dialog box will appear to confirm the Accessibility shortcut function. However, this diaglog box can't be recognized by the Screen reader. In this case, you will need assistance from someone who can select the USE SHORTCUT option.
Instead of starting from the setting menu, you can turn the desired shortcut on or off by pressing and holding the MUTING or MUTE button on the TV remote control until you hear a response sound (more than five seconds).
To switch the desired shortcut off and on again, press and holding the MUTING or MUTE button until you hear a response sound (more than five seconds).