Solved
Nothing shows up but Sunset Valley.
I've just downloaded Sims 3 again. I own all packs, and all are installed. Sunset Valley is the only world showing up. I've repaired, removed the Sims 3 folder so it could regenerate, and I don't have any mods in the game.
@texxasrose Open the Sims 3 Launcher's Expansions & Stuff tab and let me know what packs are listed there. If you do see any, check the boxes next to their names, then launch the game. This is how packs are enabled.
If you don't see your owned packs there, open the EA App game library, click Sims 3 > Manage > Manage add-ons, and post screenshots of the packs showing as installed.
