Environment:
Disk 0: 20GB
Disk 1: 950GB
Disk 2: 249.99GB
Disk 3: 160GB
System Volume: C: drive 5.86GB (on Disk 0)
Striped Volume: E: drive 30.67GB (on Disk 0, 1, 2)
RAID5 Volume: F: drive 23.83 (on Disk 0, 1, 2)
There is no available unallocated space on Disk 0, but there is enough unallocated space on Disk 1 and Disk 2.

The Problem: How to extend RAID5 Volume (F: drive) ?
The Solution: Because the Disk 0 is very small and hasn't unallocated space, so it is unable to extend RAID5 volume F: or RAID0 volume E: with "Resize/Move Volume" function. However, we can use "Add Drive to RAID" and "Remove Drive from RAID" to replace RAID5 or RAID 0 volume on Disk 0 with Disk 3. Then, extend RAID volume with "Resize/Move Volume" function.
In order to solve the problem, we need to combine three above learned functions into the solution, including "Add Drive to RAID", "Remove Drive from RAID" and "Resize/Move Volume".
Step1. Launch Aomei Dynamic Disk Manager. Click "Add Drive to RAID" in the left Wizard pane. An information window will pop up, stating that what the wizard can do. Then, click "Next".

Step2.Select RAID volume. Here we choose RAID5 volume F: and click "Next".

Step3: Specify drive. Select the available disk (here choose Disk 4) you want to add to the RAID array and click "Finish".

After completing the above steps, you will find a new RAID5 volume slice on Disk 4. Now we can remove the RAID5 volume slice on Disk 1.
Step4: Click "Remove Drive from RAID" in the left Wizard pane. An information window will pop up, stating that what the wizard can do. Then, click "Next".

Step5: Select RAID volume (Here choose RAID-5 volume F:) you want to remove drive from and click "Next". Then, specify drive. Select the existing disk (here choose Disk 1) you want to remove from the RAID array and click "Finish".

After completing the above 5 steps, RAID5 volume slice originally located on Disk 1 have been replaced with Disk 4. Then, we can extend RAID5 volume with "Resize/Move Volume".
Step6: Right-click RAID5 volume and select "Resize/Move Volume". In the pop-up window, drag the right slider rightwards to extend RAID5 volume. Then, click "OK".

At last, click "Commit" on the toolbar to perform pending operations. After rebooting, you will find the disks belonged to RAID5 array have been replaced and entire RAID5 volume has been enlarged.
Note: It will take more time to perform the operation of "Add Drive to RAID". The length of time depends on the used space size of RAID volume. In addition, the operation of "Add drive to RAID5" is essentially RAID5 volume expansion. The case aims at explaining we can use "Add Drive to RAID" and "Remove Drive from RAID" to replace disks.