Sony xbr-65x810c Help Manual page 126

Help Guide
Television
Screen format/wide mode changes automatically.
When changing the channel or video input, if [Auto wide] in [Screen] is set to [On], the current [Wide mode] setting is
automatically changed according to the input signal. To lock the [Wide mode] setting, set [Auto wide] to [Off].
Check the [Auto wide] setting in [Screen].
C-042-100-18(1)
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