Trying to format and unpartition 14TB drive for my mac

I’ve erased and reformatted both drives that came with it (to all the different mac variants), but cannot get to the partition button (it’s greyed out). I’ve done this before to other WD drives w success, but struggling here. I’m only interested in using this on my mac and don’t need all of the other supplied software that WAS installed on the drive. Any knowledge here would be appreciated! TY

Well, what WD device are you using with the two drives?

14TB Easystore desktop drive. One of the partitions is only 500mb or so, and the other is set to about 750 gb - obviously not at full capacity! Thx