After you select a disk or a partition, you can use the left click function of your mouse to start an operation. You can also select an operation from the Disk or Partition menu in Partition Resizing Software.
One thing to note is that only when you select a disk will the disk operations be effective. This is also true for partitions.
After you select an operation, unless otherwise indicated, the operation will not be carried out immediately. You must click the button Apply in the Tool Bar or Action panel for Partition Resizing Software to carry out the operation.