When I manually change the display mode settings (in the menu Screen Resolution) to any other value than AUTO, the settings automatically default back to AUTO after exiting the menu.
The same is true for the Color Space Settings in the menu Sreen Resolution. Any manual value chosen defaults back to Auto, even when one chooses the same value that the AUTO option selects.
Apparently the Screen Resolution menu does not save any manual chosen values (Display Mode and/or Color Space Settings) and always defaults back to AUTO.