Hello fellow. The in-game options to hide the HUD are limited, they do not hide everything like the ENB F10 option does. You can try to disable everything through the options menu, but you'll still see some things like the quest icons over the NPCs heads, the "press E to interact" thing, the NPC dialogues and many other HUD stuff, which I only found out how to disable using ENB. I wish there was another way, because any ENB you try to use will increase your loading times drastically and it doesn't matter much how powerful your machine is to handle graphics and such.