I am not familiar with your specific TV, but the usual rule of thumb is that the input you are using has different settings for each type of signal.
HD SDR - One set of settings.
4K - HDR - another set of settings
4K - DV - yet a third set of settings.
The good news - once sorted, as long as the TV recognises the correct format, it will select the “dialled in” settings.
The TV remembers SDR, HDR, DV and HLG settings separately, per input, so whatever changes you make for that mode on that input will be remembered next time.
In addition, each mode allows several different picture modes, each of which you can customise and which you can easily switch between from the settings menu. Eg. For each of the above modes you might customise one for viewing in bright daylight and one for a dark room.
Thanks a bunch! This was it, I hadn't realized there were multiple settings per input per signal type. I will watch the movie again tonight with a different setting.