In the campaign, you can only adjust the realism settings when in port, walking around the pen, i.e. when you're not on the boat.
Just press the 'Esc' key and edit the settings before your next patrol.
For the auto-ID of targets, it's probably added by one of the mods that gives you extra keyboard shortcuts. Might be included with Command Keys 1.03 which you have. No key or button is available in stock SH5 at the moment, I believe. I don't use it anyway, so not sure!