Advice on Configuring RAID 1 on G-Raid Thunderbolt 3 Drive

I’ve just bought an 8TB G-RAID with Thunderbolt 3 to go with my brand new iMac (running Mac OS Mojave ver: 10.14.5). I want to configure it to run as RAID1 - i.e. as two mirrored 4TB drives. I cannot find utility software on the G-Tech website which is specific to my drive & OS Can some one please advise on the best way to proceed?
Many thanks in advance, Dave

The configurator software to change the RAID is here: G-RAID /w TB3 configurator

Thanks Rydia, I have down loaded the software and configured the drive to Raid 1. Everything seems to be working ok. So thank you for your help and advice.
Kind regards,