These are the standard settings you will find for LG TVs from 2019-current. Depending on your TV, you may have to search for specific settings, but this list should get you going.
Some settings will be unavailable to toggle on or off like ATMOS if something other than TV Speakers is enabled.
Settings > Sound
> Dolby Atmos > OFF (ON only if you have a 5.1.2 setup or 3.1.4 setup)
> Sound Mode > Standard
> Sound Out > HDMI ARC (keep SIMPLINK ON)
> Sound Out > Digital Sound Out > Pass Through (Auto if Pass Through not available)
> HDMI Device Settings > Auto Device Detection > ON
> HDMI Device Settings > SIMPLINK (HDMI-CEC) > ON
> HDMI Device Settings > Auto Power Sync > ON
Settings > General
> Power Saving Mode > OFF
> Quick Start+ > OFF
-OR-
Settings > Sound
> Advanced Settings > Dolby Atmos > OFF (ON only if you have a 5.1.2 or 3.1.4 setup)
> Select Mode > Standard
> Sound Out > Use Wired Speakers >HDMI(ARC) Device (keep SIMPLINK ON)
> Advanced Settings > Digital Sound Output > Pass Through (Auto if not available)
> Advanced Settings > eARC Support > ON
> Advanced Settings > Select HDMI Input Audio Format > Auto
Settings > General
> HDMI Settings > SIMPLINK (HDMI-CEC) > ON
> Devices > TV > Quick Start+ > OFF