If you're looking to change your server to PvE or PvP, you can use this guide to switch your server. Be sure to check out our guide that includes a list of all configs if you wish to further modify your server.
1. Open the Advanced Server Settings
2. Find the line that says GameDifficulty, you can set this line to either:
0 - PvE
1 - PvP
3. Click Save Config and Restart