If you've extended a partition in your virtual machine using Disk Management but the extra space isn't showing up, it likely means you need to "extend the file system" on that partition to actually utilize the newly allocated space; this usually involves using a command-line tool like diskpart within the virtual machine's operating system. 

Here's how to fix it:

• Access the virtual machine: Log into your virtual machine where you extended the partition. 
• Open Disk Management: Go to "Computer Management" > "Storage" > "Disk Management". 
• Check for unallocated space: Verify that the extra space you added is showing as "Unallocated" in Disk Management. 
• Open Command Prompt as administrator: Search for "cmd" in the start menu, right-click and select "Run as administrator". 
• Use diskpart command:
  • Type diskpart and press Enter. 
  • Type list volume to see the list of volumes on your disk. 
  • Identify the volume you want to extend and type select volume <volume number>. 
  • Type extend to extend the selected volume to use all available unallocated space. 

Important Considerations:

• Pagefile location:

  If the pagefile is located on the partition you are trying to extend, you might need to move it to a different partition before extending. 
• File system limitations:

  Some file systems might require additional steps or specific tools to fully utilize the extended space. 
• Check for errors:

  If the issue persists, check for any disk errors using the chkdsk command in the command prompt.