Why retroarch have not all the settings ? and why dont save any change i do?

Hello, i can get retroarch from EmulationStation or in game, but i see that not all the regular settings are there, why?
And the setting that can be seted dont be saved, and the setting for save is not there!!!
Why and what can i do? ca i change that editing config files?
thanks

where i can get this information, not in wiki!

EmuELEC manages some RetroArch options through its own configuration, so the standalone RetroArch menus may be limited and changes can be overwritten. For game-specific changes, use Quick Menu > Overrides and save a game or content-directory override. For global changes, check whether the setting is exposed in EmuELEC’s system settings first. The exact config path and available options depend on your EmuELEC version and device; include both before editing files manually.