Handled in Startup or Settings tabs.
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Maps/Worlds: Startup > Map dropdown or command-line (+map TheIsland for ARK).
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Seeds: Settings > Variables (e.g., WorldSeed for Valheim/Rust procedural gen).
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Upload custom worlds via File Manager to game data folder (e.g., /Rust/save for Rust).
Wipe if needed via Backups > Delete old saves, then restart.