I started the module tool when I was playing alone, and then wanted to play online games with my friends, but I couldn't use multiplayer mode. How should I close the module tool? I cancelled subscriptions to all the modules in Creative Workshop and reinstalled the game, but it still couldn't be solved.

I recommend two actions:

1. Check the Launch Options in the properties of Endless Space 2 and make sure that the line does not contain "--enablemoddingtools".

2. Verify the integrity of the game cache. This should redownload any xml files that may not be up to date for any reason.

It was solved in the first way. Thank you very much for your help.