Data vDev greyed out

[mikebru10]

I'm using TrueNAS-SCALE-22.12.3.2, I am trying to extend a pool, I have 3x vdevs each with 5x 4TB drives. Each vDev is configured as a Raidz1. When I try to add an additional vDev with 5x 4TB drives, the data vDev type is greyed out.

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Any help would be great, I did review the Creating pools doc, and couldn't find anything to address this issue.