Unfortunately, since you installed Windows Server 2016 directly on your laptop, there's no way to easily "disconnect" and go back to Windows 10. Windows Server doesn't have a built-in rollback option for previous operating systems.
Firstly, back up your data then Download Windows 10 Creation Tool
Use the downloaded tool to create a bootable USB drive with the Windows 10 installation files. You may also try https://rufus.ie/en/
Once done, boot from the USB drive and go for a Clean install.
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Dual Booting option allows you to have both Windows 10 and Windows Server 2016 on your machine.
See:
https://www.minitool.com/backup-tips/dual-boot-windows-10-and-windows-server.html