Cannot enable “show coordinates” on Realms

When creating another world to add to my Realm, there is absolutely no preface in which I can select a seed, or add a starting chest, or anything of the like. And when I try to go into the game settings while I’m in the world, it doesn’t even show me the seed that was used. None of the world-building options used in normal worlds are there - only the options for the way the Realm runs are accessible. Has anyone else seen this?