[2021] Change Difficulty ?

You can use /openserverui as chat command, tab out of the game and access the UI and change it in theere or adjust the configuration file in /Steam/steamapps/common/Eco/Eco_Data/Server/Difficulty.eco. Please keep in mind that just replacing the collaboration level setting in the config file directly will not work, you will need to adjust each of the values manually, only the UI changes the values based on the collaboration level.