NIUBI Partition Editor is designed to work in virtual mode, the 2 operations are listed as pending on bottom left. To modify real disk partition, you need to click Apply to take effect. If you did something wrong, simply click Undo to cancel the pending operations.
About the restriction between Logical and Primary partition, if the Free space is adjacent on either side, simply follow Step 2 to combine to the partition.
Because of the inherent limitation, Disk Management cannot extend system partition in Windows 10 by shrinking drive D. To solve this problem, you need NIUBI Partition Editor to move and combine the Unallocated space. Beside Virtual Mode to avoid wrong operations, NIUBI provides unique 1 Second Rollback technology to ensure system and data intact, and advanced file-moving algorithm to help move/resize partition much faster.