Space Engineers utilises a steam group system to keep your server private. To set it up just follow the instructions below
1. Create a steam group
2. When you have created your steam group go to http://steamcommunity.com/groups/[groupname here]/memberslistxml/?xml=1 (inserting your group name into the url)
3. Copy the ID64 then log into your game panel > game services > select your server > configuration files > configuration editor
4. paste your group ID in the field "Steam Group ID"
Your server should now only appear to those in your steam group.
Looking for a game server host known for brilliant 24/7 customer support and quality hardware?
Try a Pingperfect Space Engineers server today! https://pingperfect.com/gameservers/space-engineers-game-server-hosting-rental.php