DocumentationHow can I increase the slots of my Minecraft Java Edition server? ​
Open your dashboard and select your Minecraft Java Edition server.
Go to the file browser.
Open the file
server.properties.Look for the following entry:
max-players=20max-players=20Change the value to the desired number of players.
Warning
Important: Make sure that your server has enough resources (such as RAM and CPU) to support the increased number of players.