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Open server manger -> Select “Manage” from the menu -> Select “Remove Roles and Features” as shown below.
Press next on the welcome page.
In the next screen, select the server from the server pool. By default the local server is selected, but you can perform add/remove feature task to remove server by adding server IP in server pool.
Now, you can select or unselect the options under user interface and infrastructure features option as per your requirement.
To change user interface from GUI mode to Command mode:
For full command (core) mode: Uncheck both “Graphical Management and infrastructure” and “Server Graphical shell”.
For graphical management tools and infrastructure: Uncheck only “Server Graphical shell” option
Select the features that you like to remove. This will also automatically select any dependent features that needs to be removed.
After the above step, the server will reboot. After the reboot, when the system comes back up, you’ll see not see GUI anymore. You’ll get only the command prompt.
Please note Windows Server Core 2016 does not have the ability to switch between GUI and CORE using Roles and Features Wizard.
Switching between GUI and CORE requires a fresh installation per Microsoft:
More information regarding Windows Server CORE 2016 and the difference between Server CORE and GUI is available https://docs.microsoft.com/en-us/windows-server/administration/server-core/what-is-server-core
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