OSMA ( Version 10.2.0.0)

I'm wanting to expand a virtual disk (RAID 10) to additional physical disks I've added but there is no Reconfigure option.

Current virtual made up of 10 * 600GB SAS, new disk are 4 * 1.2 TB SAS I had lying around I thought I'd put to use.

1) Is the difference in physical disk sizes causing the issue?

2) Will I be able to perform the operation in the Disk console if I reboot?

3) Can I mix in disks from another vendor into this virtual disk (have some spare 600GB Lenovo disk)