Unable for format BTRFS formatted disk in Array

I have an array that I am trying to convert to BTRFS Encrypted from BTRFS.

I emptied a drive and have been trying to format it for a while now. My issue looks to be that the clear partition button does not come up.

Hardware ? OS (I see unraid as tag) ? Commands used?

It’s running under Unraid. I haven’t done anything in the terminal yet just to be cautious, I might be doing something wrong. The hardware is consumer parts built 4U server Drives are 10-12TB WD & Seagate.

I dont run BTRFS but probably best to read the man on it and delete via comand line not sure how supported it is on Unraid as I have only ever done ZFS on unraid.

not sure if this will help

So it looks like I was making a mistake. I had to set Unassigned Devices plugin to destructive mode. There is a tiny gear icon in the corner (made even tinier by resolution scaling). Thanks for the help @mutation666

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