@Blackhero How are you starting RetroArch ? AFAIK, you need to start with a Disc enabled libretro core for the options to be available. This includes SegaCD, PCEngine-CD, 3DO and Saturn for the PI.
You should start a game in one of these systems and then check if the disk menus (LOAD/DUMP) show up.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first