Option is invisible by default but it doesn’t mean your S23 Ultra isn’t compatible.
You need a proper compatible PD charger (that supports PPS) to make this option appear.
One way to confirm that you have a proper charger, plug your phone and then go to Settings > Device care > Battery. It should indicate that is a Super Fast Charger connected (if it says Fast Charger, it doesn’t support PPS and probably won’t work with this. If it says.
Make sure that the fast charging option is enabled (in settings, battery, battery settings)
You can also check the video above, option is found in the Game Booster options and allows you to power your phone using the power cable without charging the battery.
This way you can play while saving your battery life and also generating less heat.