Nvidia optimised the original "Mafia3.exe" game. They have not updated Geforce Experience in all the time that Mafia 3 DE edition has been available.

Just rename the exe as "Mafia3.exe" and you should be golden

Thanks for your response. That didn't work.

Last time I tried this, it would only utilize the base game and none of the DLC was available to me. Still the case or was I doing something wrong? She runs well on my 2060 but I have a 4070 sitting under the tree (bought it for myself but the kids are giving it to me for Christmas).