HDM 14 is rather old and notatall compatible with Win 10 - just to mention that.
From the colour of the partition I'd suppose it's bitlockered. That kind of partition cannot be modified with our programs: BitLocker-Encrypted (BDE) Partition Support. Copy and backup is possible with some effort in HDM 15 and later. Partitioning is not possible. HDM 14 and older do not support Bitlocker at all.
Are all Windows 10 partitions bitlockered? Because I don't have this problem on my desktop and there are other partitions on this computer that can be resized.
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