To disable command-blocks on your Minecraft server, log into Multicraft, select and stop your Minecraft server and follow these steps:
On the left hand side of your control panel click the "Files" dropdown box.
Click "Config Files".
Choose the first file named "Server Settings".
Scroll down to the Enable Command Block field.
Type "false" in the text box.
Start your Minecraft server.
Updated on: 11 / 18 / 2020