Put the summary of the bug you're having here

What I expected to happen was...:
I expected to be able to alter my realms settings from the world selection menu, like adding resource packs or swapping between creative and survival, or even downloading a copy of the world

What actually happened was...:
I am instead prompted to upload a new blank world, the one I first played on way back years ago, or some realms celebration world... but I don't want to do that because my friends and I have been playing on this world for over a month now. When I click the "manage realm" tab all I can edit for the world itself is the name and description...

Steps to Reproduce:
1. open minecraft
2. click "play"
3. Click on the pencil icon next to my realm

4. get upset that I can't edit my settings