This mod would be a perfect fit for any vanilla player wanting to discover their world by other means and it would be sweet to have access to the previewer while the game is running

This should be technically possible (at least for single player) and nice to have, but I won't make any promises.

Implemented for single-player worlds. Multiplayer won't happen, since there isn't even a reliable way for getting the seed from the server...

Well there are some pretty reliable ways to get the seed but might not be tolerated everywhere 👀

However, for servers that give the seed to players, it might still be interesting to be able to access the panel, even without pre-inserted seed

Anyway, thanks again for this feature 😄