Manage worlds

The Worlds tab lists the worlds already on your server and lets you switch which one loads on the next boot or remove one you no longer need. It runs the same world every boot until you change that here — nothing about world selection changes on its own between starts.

Switch the active world

Each world in the list shows whether it's the active one or just linked. Only one world can be active at a time; that's the one the server loads on its next start. To switch, use Set active next to a linked world. The change doesn't apply immediately — the panel tells you it applies on the next start, so restart the server afterward if you want to play on it right away.

Delete a world

Delete next to a linked world removes it permanently — the panel asks you to confirm first, and there's no undo. You can't delete the active world from this list; switch to a different one first if you want to get rid of the one currently loaded. If you might want a world back later, take a backup first — it archives your whole /data directory, worlds included — or pull the folder over SFTP; the Files tab itself can't download a folder (see below).

Getting a world onto the server

This tab doesn't create worlds itself — it only manages the ones already present. If the list is empty, start the server once and it generates a fresh world (or, if SFTP is enabled for your server under Settings, you can upload one that way). The Files tab can't move a whole world folder in or out either — it uploads and downloads individual files, not folders. For a whole world folder, use SFTP instead.

Recommended plugins

Below the world list, non-Vanilla servers see recommendations — which ones depends on your server core:

• Multiverse-Core, for managing multiple worlds on one server, shows an install button only on Paper and Purpur.
• Spark, a performance profiler you run with /spark profiler in the Console to diagnose TPS drops, shows an install button on cores other than Paper/Purpur (Fabric, Forge, NeoForge). On Paper and Purpur it's a different story: at versions we've confirmed bundle it in the server jar, the panel tells you to just run the command — nothing to install. On older or unconfirmed Paper/Purpur versions, there's no install button either; the panel points you to add the jar yourself under Plugins → Upload .jar, because spark doesn't publish an installable Paper/Bukkit build at all.

Installed plugins apply on the next start, same as everywhere else in the panel.

This isn't world import

If you're trying to bring a world archive you already have onto the server — from another host, a local install, or a backup — that's a different control, on Settings → Version & world, not here. See Import an existing world for the size limit, accepted formats, and what it replaces.

Troubleshooting

Set active / Delete did nothing. Check the row for an error message under the world's name — a failed request shows the reason there rather than silently doing nothing.

I don't see any recommended plugins. Vanilla servers don't show this section at all — those tools are plugins, and Vanilla doesn't run plugins. Multiverse-Core only appears on Paper and Purpur; on other cores that's expected.