You can easily decide how many people are allowed to join your server at the same time by adjusting the max-players setting.
What does max-players do?
This setting sets a limit on the number of player slots available. For example, if you set it to 50, then the 51st person who tries to join will receive a "Server is full" message. To make changes, follow these simple steps:
Step 1: Open the Control Panel
Log in to your game panel at https://client.d-serv.eu/
Select the Minecraft server you want to modify.
Step 2: Locate the Configuration File
From the left-hand menu, click on Files.
Find and open the file named server.properties.
Step 3: Edit the Max-Players Setting
Look for the line that says max-players=20
Change the number to whatever you prefer. For example, change it to max-players=50 to allow 50 people to join.
Step 4: Save and Restart
Click the Save content button to store your changes.
Restart your server from the main console to apply the new limit.
While you can set this number very high, remember that more players require more server memory (RAM). If you notice the server lagging with many people online, you may need to lower this number or upgrade your server plan.