If you want to lower or increase the amount of players that can be logged into the server at one time, you can follow these steps to do so. Please note that increased player counts may increase ram usage on your server and reach your ram cap.
1. Open the File Manager
2. Right click docker-compose.yml
and click Edit
3. Change MAX_PLAYERS
to your preferred number of player slots.
4. Save the file
5. Save Config & Restart the server in the Basic Server Settings.