After change the Windows server tariff plan, you need to resize the disk yourself and make the new space available for the operating system.
To do this, the first step is to connect to the server via RDP.
After booting the system, go to "Control Panel "
Then go to "System and Security" → "Administration "
Open the console "Computer Management" → "Disk Management "
In the disk list, find the disk that has unallocated space
Right-click on the partition of the disk where you want to increase the size and select "Expand volume... "
This will open the "Volume Expansion Wizard. Click "Next "
Choose the size of the unpartitioned area to enlarge the disk size and click "Next "
Click "Finish " to finish
The disk size has been increased and is available for use by the system.
