If your monitor is set to an Adobe RGB mode, you could pick Adobe RGB here.
But, monitors there ere high end enough to support a proper Adobe RGB mode z often have their own profiles supplied (or made by calibrating ) and those should be set in your operating system display settings.
In that case, you must pick 'system display profile ’ in darktable (which means use the profile that is set in the operating system ).
But the whole concept of calibrating screens, color management and how it works (and the pit falls ) are something I find hard to explain over the internet.
So far that I normally tell people to set their screen to sRGB mode, make sure the operating system has no profile set, and then leave the profile option in darktable alone. And only if you know what you are doing , mess with options.