I realize this is way late, but I think someone might find it useful.
I was looking at the auto setting and it seemed to be not the right aspect ratio for 32:9, so I went on a hunt for the configuration file.
You can actually set custom aspect ratio for 32:9 by changing the hardware_settings_config.xml file.
In there just change it to <aspectRatio auto="false" width="32" height="9" /> and it will show up in game as custom.
Hopefully this is helpful to someone.
Solution by modifying Documents\My Games\F1 2019\hardwaresettings