Therefore, a FAT partition may need to be deleted or reformatted if you wish to extend it.
Even unallocated space before (to the left) the volume willnot sufficeto extend the volume.
Another thing to note is that an MBR partition may not expand beyond 2 TBs.

This could be the reason why the Extend Volume option is greyed out on your Management Console.
The Disk Management Console offers various controls to the user for better manageability.
attempt to extend the partition now and see if the issue has been resolved.

If the issue persists, there is likely no unallocated/available space for the partition to expand to.
Deleting the volume will erase all the data on it.
Note:This method is only applicable for non-boot volumes.

This means that the system volumes cannot be extended using the given method.
They will even work if you find the Extend Volume option grayed out in the Disk Management Console.
There are a variety of such tools available on the internet.

However, these tools will perform all the shrinking and extending tasks required to get the job done.
However, those are only helpful in performing the basic partition-related tasks.
Verdict
Extending volumes often becomes a necessity.
Therefore, investing in a third-party partitioning tool once in a lifetime may not be such a bad idea.
These tools can also perform other critical tasks, such as data recovery, data migration, etc.
This article is a part of our ongoing Disk cleanup and optimization series.
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source: www.itechtics.com