Editing your server.properties file allows you to change all the settings for your Minecraft server.
To edit it, click on the Manage button for your Minecraft server instance:

Select File Manager:

Double-click on the server.properties file to open the Text Editor window, where you will be able to edit all the needed parameters. Once you’re done, click Save:
Now, just right-click the server properties file and select Import Configuration:

That’s it! Now you know how to edit the hidden settings on your Minecraft server 😊
NOTE:
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If the settings are not imported, they are lost upon server restart